Question

谁可以帮我做初一年的二元一次方程组啊?

1.{m n
— - — =3
3 4
{m n
— - — =13
2 3

2. {x+y 5x+4y
—— = ——
2 5
{x+y
—— = 1
2

3.{-2x+y=1
{3x+4y=-18

4.{x+2 y-1
—— —— = 2
3 2
{x+2 1-y
—— —— = 1
3 2

5.{x+3 y+5
—— + —— =7
2 2
{x+4 2y-3
—— + —— = 2
3 5

6.{5x+2y=25
{3x+4y=15

7.{ 5 2
—x + —y =-21
2 3
{ x y
— - — = -1
3 9

8.{x-y x+y 1
—— - —— = - —
5 2 10
{x-y x+y 1
—— - ——= —
7 6 2

9.{2x+3y=1
{3x+5y=1

10.{5x-6y=9
{7x-4y= -5

11.{3x-y=4
{2x-3y= -2

12.{x y
— + — = 7
4 3
{2 y
—x + — =14
3 2
显示有点问题.如分母无法跟分数线对齐.第4.题的是加号.

Answer 1

456