-4(qp+pr)+(4qp+pr) -5(x-2y+1)-(1-3x+4y) 1-3(x-(1/2)y^2)+(-x+(1/2)y^2)
-4(qp+pr)+(4qp+pr)-5(x-2y+1)-(1-3x+4y)1-3(x-(1/2)y^2)+(-x+(1/2)y^2)...
-4(qp+pr)+(4qp+pr) -5(x-2y+1)-(1-3x+4y)
1-3(x-(1/2)y^2)+(-x+(1/2)y^2) 展开
1-3(x-(1/2)y^2)+(-x+(1/2)y^2) 展开
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