题目内容
计算:
(1)(a-2)(a+2)(a2+4)
(2)(2m3n2+3m2n2-mn3+4mn)÷(-6mn)
(1)(a-2)(a+2)(a2+4)
(2)(2m3n2+3m2n2-mn3+4mn)÷(-6mn)
(1)原式=(a2-4)(a2+4)=a4-16;
(2)原式=-
m2n-
mn+
n2-
.
(2)原式=-
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