去括号之后:
5x -11y =-12 (1)
-x +y = 8 (2)
(2)×5+(1):
-6y = 48
y = -8
带入到(2):
-x = 16
x = -16
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怎么解二元一次方程组2(x-y)/3-x+y/4=-1和6(x+y)-4(2x-y)=16
怎么解二元一次方程组2(x-y)/3-x+y/4=-1和6(x+y)-4(2x-y)=16
数学人气:386 ℃时间:2020-01-25 15:05:34
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