题目内容
【题目】脱式计算.(能简算的要简算)
2.5×9.02×4
30.6×1.5﹣1.4
3.2+2.08×0.6
3.8×3.5+6.2×3.5.
【答案】90.2;44.5;4.448;35
【解析】
试题分析:(1)根据乘法交换律进行简算;
(2)先算乘法,再算减法;
(3)先算乘法,再算加法;
(4)按照乘法分配律进行简算.
解:(1)2.5×9.02×4
=(2.5×4)×9.02
=10×9.02
=90.2
(2)30.6×1.5﹣1.4
=45.9﹣1.4
=44.5
(3)3.2+2.08×0.6
=3.2+1.248
=4.448
(4)3.8×3.5+6.2×3.5
=(3.8+6.2)×3.5
=10×3.5
=35
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