题目内容
2.脱式计算下面各题.(585-265)÷(82-78) | 126-5590÷86+72 | 312×4+188×4 |
101×87 | 9.56+3.44×10 | (1.32-0.23)×100 |
分析 (1)先算减法,再算除法;
(2)先算除法,再算减法,最后算加法;
(3)(4)(6)利用乘法分配律简算;
(5)先算乘法,再算加法.
解答 解:(1)(585-265)÷(82-78)
=320÷4
=80;
(2)126-5590÷86+72
=126-65+72
=61+72
=133;
(3)312×4+188×4
=(312+188)×4
=500×4
=2000;
(4)101×87
=100×87+1×87
=8700+87
=8787;
(5)9.56+3.44×10
=9.56+34.4
=43.96;
(6)(1.32-0.23)×100
=1.32×100-0.23×100
=132-23
=109.
点评 整数混合运算的关键是抓住运算顺序,正确按运算顺序计算即可.
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