题目内容

2.脱式计算.
(6-4.29)÷0.01                           
93÷0.31÷3
0.32×101                                
6.63×2.7+7.3×6.63
8.74-15.12÷3.6                           
3.9×1.25×0.8.

分析 (1)先算括号内的减法,再算括号外的除法;
(2)从左往右依次计算;
(3)把101看作100+1,运用乘法分配律简算;
(4)运用乘法分配律简算;
(5)先算除法,再算减法;
(6)运用乘法结合律简算.

解答 解:(1)(6-4.29)÷0.01 
=1.71÷0.01
=171

(2)93÷0.31÷3
=300÷3
=100

(3)0.32×101                                
=0.32×(100+1)
=0.32×100+0.32
=32+0.32
=32.32

(4)6.63×2.7+7.3×6.63
=6.63×(2.7+7.3)
=6.63×10
=66.3

(5)8.74-15.12÷3.6
=8.74-4.2
=4.54

(6)3.9×1.25×0.8
=3.9×(1.25×0.8)
=3.9×1
=3.9

点评 完成此题,注意运算顺序和运算法则,灵活运用所学的运算定律简便计算.

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