5x+2y=12,3x+2y=-6,求x= ,y=
2个回答
5x+2y=12,.(1)
3x+2y=-6 .(2)
(1)-(2):2x=18,x=9
5*9+2y=12,2y=-33,y=-33/2
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[12(x+y)^3+3(x+y)(x-y)^2]÷6(x+y)