解方程组 2(x-1)+3(1+y)=2 4x-2(y+x)=11
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解方程组 2(x-1)+3(1+y)=2 4x-2(y+x)=11
2x+y=13 7x+9y=84
就两个!拜托了!.
2x+y=13 7x+9y=84
就两个!拜托了!.
2(x-1)+3(1+y)=2 4x-2(y+x)=11
2x-2+3+3y=2 4x-2y-2x=11
2x+3y=1 (1) 2x-2y=11 (2)
(1)-(2) 5y=-10 y=-2
把y=-2,带入 2x+3y=1 2x=7 x=3.5
{x=3.5 y=-2
2x+y=13
y=13-2x
7x+9y=84
7x+9(13-2x)=84
7x+117-18x=84
11x=33 x=3
y=13-2×3=7
{x=3
y=7
2x-2+3+3y=2 4x-2y-2x=11
2x+3y=1 (1) 2x-2y=11 (2)
(1)-(2) 5y=-10 y=-2
把y=-2,带入 2x+3y=1 2x=7 x=3.5
{x=3.5 y=-2
2x+y=13
y=13-2x
7x+9y=84
7x+9(13-2x)=84
7x+117-18x=84
11x=33 x=3
y=13-2×3=7
{x=3
y=7
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