题目内容
【题目】计算下面各题,能简算的要简算.
48×(+﹣) 1.25×3.2×0.25 7﹣7×+
35×(1﹣)÷÷19+×+×.
【答案】50,1,4,48,,
【解析】
试题分析:(1)运用乘法分配律简算;
(2)把3.2看作0.8×4,运用乘法结合律简算;
(3)先算乘法,再算加减;
(4)算出括号内的结果,把除法改为乘法,月份计算即可;
(5)把除法改为乘法,运用乘法分配律简算;
(6)先算乘法,再算加法.
解:(1)48×(+﹣),
=48×+48×﹣48×,
=40+30﹣20,
=50;
(2)1.25×3.2×0.25,
=1.25×0.8×(4×0.25),
=1×1,
=1;
(3)7﹣7×+,
=7﹣3+,
=4+,
=4;
(4)35×(1﹣)÷,
=35××,
=48;
(5)÷19+×,
=+×,
=(+)×,
=;
(6)+×,
=+,
=.
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