精英家教网 > 小学数学 > 题目详情
47.9×0.6×5     0.25×36     2.8×10.1
3.14×6.9+3.14×3.1     0.8×(3×1.25) 69.3×8-9.3×8.
分析:(1)利用乘法结合律简算;
(2)把36拆成4×9简算;
(3)(4)(6)利用乘法分配律简算;
(5)利用乘法交换律简算.
解答:解:(1)47.9×0.6×5
=47.9×(0.6×5)
=47.9×3
=143.7;

(2)0.25×36    
=0.25×4×9
=1×9
=9;

(3)2.8×10.1
=2.8×(10+0.1)
=2.8×10+2.8×0.1
=28+0.28
=28.28;

(4)3.14×6.9+3.14×3.1
=3.14×(6.9+3.1)
=3.14×10
=31.4;

(5)0.8×(3×1.25)
=0.8×1.25×3
=1×3
=3;

(6)69.3×8-9.3×8
=(69.3-9.3)×8
=60×8
=480.
点评:混合运算注意运算顺序,抓住数字特点与运算符号,选用适当的运算定律简算.
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