题目内容

3.计算下面各题,能简算的要简算
0.125×32×0.25               4.38×6.5+2.5×4.38+4.38
(5.4×8.2+1.8×5.4)÷5.4         25.25×4-0.99
(12.5+0.125)×8                 17.68÷[6.5×(2.7-1.9)]

分析 (1)把32分解成8×4再根据乘法结合律和乘法交换律进行计算;
(2)根据乘法分配律进行计算;
(3)先根据乘法分配律算括号里面的,再进行计算;
(4)把25.25转化为25+0.25再根据乘法分配律简算;
(5)根据乘法分配律进行计算;
(6)先算小括号里面的,再算中括号里面的,最后算括号外面的.

解答 解:(1)0.125×32×0.25
=0.125×8×4×0.25
=(0.125×8)×(0.25×4)
=1×1
=1;

(2)4.38×6.5+2.5×4.38+4.38
=4.38×(6.5+2.5+1)
=4.38×10
=43.8;

(3)(5.4×8.2+1.8×5.4)÷5.4
=5.4×(8.2+1.8)÷5.4
=5.4×10÷5.4
=10;

(4)25.25×4-0.99
=(25+0.25)×4-0.99
=25×4+0.25×4-0.99
=100+1-0.99
=100.01;

(5)(12.5+0.125)×8  
=12.5×8+0.125×8
=100×1
=100;

(6)17.68÷[6.5×(2.7-1.9)]
=17.68÷[6.5×0.8]
=17.68÷5.2
=3.4.

点评 本题主要考查了学生根据题目特点采用不同方法来灵活进行计算的能力.

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