题目内容

2.脱式计算下面各题.
(585-265)÷(82-78)126-5590÷86+72312×4+188×4                               
101×879.56+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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