题目内容
计算:
(1)4(m+1)2-(2m+1)(2m-1);
(2)(21x4y3-35x3y2+7x2y2)÷(-7x2y).
(1)4(m+1)2-(2m+1)(2m-1);
(2)(21x4y3-35x3y2+7x2y2)÷(-7x2y).
(1)原式=4m2+8m+4-4m2+1
=8m+5;
(2)原式=-3x2y2+5xy-y.
=8m+5;
(2)原式=-3x2y2+5xy-y.
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