计算:(1)5s2t-2s2t;(2)-22+20-|-3|×(-3)-1;(3)(a2b)(-2ab2)(-0.5a4b5);(4)4m2-(-2m+3)(-2m-3).-数学

题目简介

计算:(1)5s2t-2s2t;(2)-22+20-|-3|×(-3)-1;(3)(a2b)(-2ab2)(-0.5a4b5);(4)4m2-(-2m+3)(-2m-3).-数学

题目详情

计算:
(1)5s2t-2s2t;
(2)-22+20-|-3|×(-3)-1
(3)(a2b)(-2ab2)(-0.5a4b5);
(4)4m2-(-2m+3)(-2m-3).
题型:解答题难度:中档来源:不详

答案

(1)原式=(5-2)s2t
=3s2t;

(2)原式=-4+1-3×(-class="stub"1
3

=-4+1+1
=-2;

(3)原式=(-2)×(-0.5)a7b8
=a7b8;

(4)原式=4m2-(-2m)2+9
=9.

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