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下列计算不正确的是A.(3x-4y)(5x+6y)=15x²+2xy-24y²B.(2a²-1)(a-4)-(a+3)(a²-1)=a³-11a²+7C.(x+2)(y+3)-(x-1)(y-2）=5x+3y+4D.(x+y)(x²+xy+y²)-(x+y)(x²-xy+y²)=-2y³
题目详情
下列计算不正确的是
A.(3x-4y)(5x+6y)=15x²+2xy-24y²
B.(2a²-1)(a-4)-(a+3)(a²-1)=a³-11a²+7
C.(x+2)(y+3)-(x-1)(y-2）=5x+3y+4
D.(x+y)(x²+xy+y²)-(x+y)(x²-xy+y²)=-2y³
A.(3x-4y)(5x+6y)=15x²+2xy-24y²
B.(2a²-1)(a-4)-(a+3)(a²-1)=a³-11a²+7
C.(x+2)(y+3)-(x-1)(y-2）=5x+3y+4
D.(x+y)(x²+xy+y²)-(x+y)(x²-xy+y²)=-2y³
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