2x-3y=5{2x-2y=-2咋算要全部过程
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2x-3y=5{2x-2y=-2咋算要全部过程
2x-3y=5{2x-2y=-2咋算要全部过程
2x-3y=5{2x-2y=-2咋算要全部过程
方程组
2x-3y=5 (1)
2x-2y=-2 (2)
(1)-(2)得
-y=7
y=-7
带入(1)得
x=(5+3y)/2=(5-3*7)/2=-8
所以方程组的解为x=-8 y=-7
2x-3y=5①
2x-2y=-2②
①-②
2x-3y-2x+2y=5+2
-y=7
y=-7
2x-3*(-7)=5
2x+21=5
2x=-16
x=-8
两式相减,得-y=7 y=-7
将y=-7代入1式,得2x+21=5 x=-8
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