二元一次方程面积题

一、二元一次方程面积题

设长方形长为xcm，宽为ycm，则

x-5＝y+2……长方形变成正方形

(x-5)×（y＋2）=x×y……面积相同

x-5＝y+2 －－－> x=y+7

(x-5)×（y＋2）=x×y ---> 2x-5y=10 带入x=y+7得 2y+14-5y=10,得y＝4/3

所以x＝25/3

所以长方形长为25/3，宽为4/3。

二、新概念英语作业题目 连词成句

1.We usually go out for a walk after supper.

2.He told us that he would leave soon.

3.Has your car already been repaired?

4.Your books were placed under the table.

5.He was very angry at what we said.

三、15个英语完形填空题

mice

cleaner

friend's

has built

my  to help

stayed

to make

polluted

would snow   snowing

have looked

have waited

looked    paper    passed

little

doesn't work

studying

13题好像有点错

四、C语言实训题，急，求各位大大帮忙！

1、#include #include int isprime(int n) { int k=(int)sqrt(n); for(int i=2;i<=k;i++) { if(n%i==0) return 0; } return 1; } void main() { int a; scanf(%d,&a); if(isprime(a)) printf(%d is a prime.\n,a); else printf(%d is not a prime.\n,a); }2、#includeint main(){ char a[];int i;i=strlen(a[]);printf(%d,i);return 0;}

五、奥赛题二道！

（1）19

（2）50