5x+2y=2,7x-5y=-11 用加减法解下列方程组
人气：276 ℃ 时间：2020-02-20 15:23:27
解答
5x+2y=2,---------1
7x-5y=-11 ---------2
式1*5+式2*2,得
25x+10y=10
14x-10y=-22
39x=-12
x=-4/13
将x=-4/13代入式1,得
y=6/13
推荐
猜你喜欢
- 有don't do sth instead of doing的用法吗,怎么翻译?
- A successful team beats with one heart是什么意思
- he often___(relax) half a day
- 用作图法求直线斜率时,必须采用什么方法?
- Edward Smith is _____old.He works in a bank.
- 连词成句 threw,Li,Ming,the,ball,another,boy,to
- Lily doesn't want to buy__same present__Lucy did填空
- 麻烦您了,您帮我看看这道题呗 we see things by our eyes对么?为什么
