Question

{2X=5(X+Y) 3X-10(X+Y)=2

Answer 1

...1

x/2+y/3=2.2

先化简,由1式得

4x-y-5=0.3

由2式得

3x+2y-12=0.4

3式*2+4式得

8x+3x-10-12=0,

x=2,

y=3

2(x-y)/3 - (x+y)/4=-1.1

6(x+y)-4(2x-y)=16.2

由1式得

8（x-y）-3(x+y)=-12

5x-11y+12=0.3

由2式得

10y-2x-16=0 .4

3式*2+4式*5得

28y-56=0

所以 y=2

将y=2代入1式得

x=2