x+2y=140 4x+3y=360 3Q!
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x+2y=140 4x+3y=360 3Q!
![x+2y=140 4x+3y=360 3Q!](/uploads/image/z/18554954-50-4.jpg?t=x%2B2y%3D140+4x%2B3y%3D360+3Q%21)
4X+8Y=960
4X+3Y=360
5Y=600
Y=120
X=-100
4X+3Y=360
5Y=600
Y=120
X=-100
已知全集为R,集合P={y|y=x的二次方+4x+1,x∈R},Q={y|y=-x的二次方+2x+3,x∈R}求P∩Q和
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x+y/2+x-y/3=6,4(x+y)-3(x-y)=-20
{(x+y)/2+(x-y)/3=6 4(x+y)-3(x-y)=-20
4(x+y)-3(x-y)=-20,2/x+y+3/x-y=6
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