题目内容
计算:
(1)(3x2y)3•(-5y);
(2)[(x+y)2-y(2x+y)-4x]÷2x.
(1)(3x2y)3•(-5y);
(2)[(x+y)2-y(2x+y)-4x]÷2x.
(1)原式=27x6y3•(-5y)=-135x6y4;
(2)原式=(x2+y2+2xy-2xy-y2-4x)÷2x
=(x2-4x)÷2x
=
x-2.
(2)原式=(x2+y2+2xy-2xy-y2-4x)÷2x
=(x2-4x)÷2x
=
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