From 8dd05e72f4394046555cc6b9773f2ea4668c387b Mon Sep 17 00:00:00 2001
From: Charlotte-Miller <42000591+Charlotte-Miller@users.noreply.github.com>
Date: Wed, 15 Apr 2020 17:55:42 +0700
Subject: [PATCH] =?UTF-8?q?Ch=E1=BB=AFa=20b=C3=A0i?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 bt4.js | 196 +++++++++++++++++++++++++++++++++++++--------------------
 1 file changed, 127 insertions(+), 69 deletions(-)

diff --git a/bt4.js b/bt4.js
index 20af786..b9a0cf5 100644
--- a/bt4.js
+++ b/bt4.js
@@ -1,110 +1,168 @@
 //1.
 
-// let n = Number(prompt('Nhap so N'));
+// let n = Number(prompt("Nhap so N"));
+
 // let tc = 0;
 // let tl = 0;
-// for (let i = 0;i<=n;i+=2) {tc=tc+i};
-// for (let i1= 1;i1<=n;i1+=2) {tl=tl+i1};
+
+// for (let i = 0; i <= n; i += 2) {
+//   tc = tc + i;
+// }
+
+// for (let i1 = 1; i1 <= n; i1 += 2) {
+//   tl = tl + i1;
+// }
+
 // console.log(`Tong cac so chan trong doan tu 1 den N: ${tc}
 // Tong cac so le trong doan tu 1 den N : ${tl}`);
 
-
 //2.
 
-// let n = Number(prompt('Nhap so N'));
+// let n = Number(prompt("Nhap so N"));
 // let snt = true;
-// if ((Math.floor(n)!=n) || n<=1) {console.log('N phai la so tu nhien >1')}
-// else {for (let i=2;i<=Math.sqrt(n);i++) {
-//     if (n%i == 0) {snt = false;break}
-// }
-// }
-// console.log(snt);
 
+// if (Math.floor(n) != n || n <= 1) {
+//   console.log("N phai la so tu nhien >1");
+// } else {
+//   for (let i = 2; i <= Math.sqrt(n); i++) {
+//     if (n % i == 0) {
+//       snt = false;
+//       break;
+//     }
+//   }
+// }
+// console.log(snt); // B nên cho in kết quả vào nhánh else để tránh in "true" mặc dù ko thỏa mãn điều kiện
 
 //3.
 
-// let n = Number(prompt('Nhap so N'));
-
-// for (let x=0;x<=n;x++) {
-//      let snt = true;
-//      if (x < 2) {snt = false}
-//      else if (x == 2){snt = true}
-//      else {for (let i = 2; i <= Math.sqrt(x); i++)
-//             {if (x%i == 0) {snt = false;
-//                               break;}
-//             }
-//         }
-//         if (snt == true) {console.log(x)}
-//         }
-    
+// let n = Number(prompt("Nhap so N"));
+
+// for (let x = 0; x <= n; x++) {
+//   let snt = true;
+//   if (x < 2) {
+//     snt = false;
+//   } else if (x == 2) {
+//     snt = true;
+//   } else {
+//     for (let i = 2; i <= Math.sqrt(x); i++) {
+//       if (x % i == 0) {
+//         snt = false;
+//         break;
+//       }
+//     }
+//   }
+//   if (snt == true) {
+//     console.log(x);
+//   }
+// }
 
 //4.
 
-
 // let a = 1;
 // let b = 0;
-// let c
-// for (let n = (Number(prompt("nhap n"))-1);n>=0; n--) {c = a; a = a+b; b = c};
-// console.log(b)
+// let c;
+// for (let n = Number(prompt("nhap n")) - 1; n >= 0; n--) {
+//   c = a;
+//   a = a + b;
+//   b = c;
+// }
+// console.log(b);
 
 //5.
 
 // let a = 0;
+
 // while (true) {
-//     let n = Number(prompt('Nhap n'));
-//     if (n>=0) {a=a + n}
-//     else {break};}
-// console.log(`Tong cac so da nhap = ${a}`);
+//   let n = Number(prompt("Nhap n"));
 
+//   if (n >= 0) {
+//     a = a + n;
+//   } else {
+//     break;
+//   }
+// }
+// console.log(`Tong cac so da nhap = ${a}`);
 
 //6.
 
-// let ss = prompt('Nhap chuoi bat ki');
-// let xx ='';
-// for (let i=ss.length-1 ; i>=0; i--) {xx=xx+ss[i]};
-// if (ss==xx) {console.log('chuoi doi xung')}
-// else {console.log('Chuoi khong doi xung')};
+// let ss = prompt("Nhap chuoi bat ki");
+// let xx = "";
+
+// for (let i = ss.length - 1; i >= 0; i--) {
+//   xx = xx + ss[i];
+// }
+
+// if (ss == xx) {
+//   console.log("chuoi doi xung");
+// } else {
+//   console.log("Chuoi khong doi xung");
+// }
 
 //7.
 
-// let m = Number(prompt('Nhap chieu dai'));
-// let n = Number(prompt('Nhap chieu rong'));
-// let hcn ='';
-// for (let i=1;i<=m;i++) {for (let x=1;x<=n;x++) {hcn=hcn+'*'};hcn=hcn+'\n'};
+// let m = Number(prompt("Nhap chieu dai"));
+// let n = Number(prompt("Nhap chieu rong"));
+
+// let hcn = "";
+
+// for (let i = 1; i <= m; i++) {
+//   for (let x = 1; x <= n; x++) {
+//     hcn = hcn + "*";
+//   }
+//   hcn = hcn + "\n";
+// }
 // console.log(hcn);
 
 //8.
 
-// let a = Number(prompt('Tong so ga va cho'));
-// let b = Number(prompt('Tong so chan'));
-// let x = (4*a-b)/2;
+// let a = Number(prompt("Tong so ga va cho"));
+// let b = Number(prompt("Tong so chan"));
+
+// let x = (4 * a - b) / 2;
 // let y = 36 - x;
-// if ((4*a-b)>=0 && (2*a)<=b &&  Math.floor((4*a-b)/2)==((4*a-b)/2)) {
-// console.log(`So ga la : ${x}`);
-// console.log(`So cho la : ${y}`);}
-// else {console.log('Ko co ket qua')};
+
+// if (
+//   4 * a - b >= 0 &&
+//   2 * a <= b &&
+//   Math.floor((4 * a - b) / 2) == (4 * a - b) / 2
+// ) {
+//   console.log(`So ga la : ${x}`);
+//   console.log(`So cho la : ${y}`);
+// } else {
+//   console.log("Ko co ket qua");
+// }
 
 //9.   ax + by = c
 //     a1x+ b1y = c1
 //  (a-a1)x + (b-b1)y  = c-c1
 
-// let a = Number(prompt('Nhap a'));
-// let b = Number(prompt('Nhap b'));
-// let c = Number(prompt('Nhap c'));
-// let a1 = Number(prompt('Nhap a1'));
-// let b1 = Number(prompt('Nhap b1'));
-// let c1 = Number(prompt('Nhap c1'));
-// let x = (c-c1)/(a-a1);
-// let y = (c-c1)/(b-b1);
-// let y1 = (c-c1)/(b-b1) +'-'+ (((a-a1)/(b-b1))+'*x')
-
-
-// if ((a-a1)==0 && (b-b1)==0 && (c-c1)==0) {console.log(`x co vo so nghiem
-// y co vo so nghiem`)}
-// else if ((a-a1)==0 && (b-b1)==0 && (c-c1)!==0) {console.log(`PT vo nghiem`)}
-// else if ((a-a1)!==0 && (b-b1)==0) {console.log(`x = ${x}
-// y co vo so nghiem`)}
-// else if ((a-a1)==0 && (b-b1)!==0) {console.log(`x co vo so nghiem
-// y = ${y}`)}
-// else if ((a-a1)!==0 && (b-b1)!==0) {console.log(`X co vo so nghiem
-// y = ${y1}`)};
\ No newline at end of file
+// let a = Number(prompt("Nhap a"));
+// let b = Number(prompt("Nhap b"));
+// let c = Number(prompt("Nhap c"));
+
+// let a1 = Number(prompt("Nhap a1"));
+// let b1 = Number(prompt("Nhap b1"));
+// let c1 = Number(prompt("Nhap c1"));
+
+
+// // B check lại thuật toán giải nhé, mình test thử thấy kết quả không đúng
+
+// let x = (c - c1) / (a - a1);
+// let y = (c - c1) / (b - b1);
+// let y1 = (c - c1) / (b - b1) + "-" + ((a - a1) / (b - b1) + "*x");
+
+// if (a - a1 == 0 && b - b1 == 0 && c - c1 == 0) {
+//   console.log(`x co vo so nghiem
+// y co vo so nghiem`);
+// } else if (a - a1 == 0 && b - b1 == 0 && c - c1 !== 0) {
+//   console.log(`PT vo nghiem`);
+// } else if (a - a1 !== 0 && b - b1 == 0) {
+//   console.log(`x = ${x}
+// y co vo so nghiem`);
+// } else if (a - a1 == 0 && b - b1 !== 0) {
+//   console.log(`x co vo so nghiem
+// y = ${y}`);
+// } else if (a - a1 !== 0 && b - b1 !== 0) {
+//   console.log(`X co vo so nghiem
+// y = ${y1}`);
+// }