计算:
(1)
(−)−2+()0+(−5)3÷(−5)2;
(2)(m+3n)(m-2n)-(2m-n)
2.
人气:403 ℃ 时间:2020-05-21 09:22:05
解答
(1)原式=9+1-5
=5;
(2)原式=m2-2mn+3mn-6n2-4m2+4mn-n2
=-3m2+5mn-7n2.
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