题目内容

计算,能用简便方法的用简便方法.
101×5.8 0.25×12.8×0.4
0.27×7.2+0.27×2.8 2.35×0.15-0.15×0.35.
分析:(1)把101看作(100+1),运用乘法分配律简算;
(2)运用乘法交换律简算;
(3)(4)运用乘法分配律简算.
解答:解:(1)101×5.8,
=(100+1)×5.8,
=100×5.8+5.8,
=580+5.8,
=585.8;

(2)0.25×12.8×0.4,
=0.25×0.4×12.8,
=0.1×12.8,
=1.28;

(3)0.27×7.2+0.27×2.8,
=0.27×(7.2+2.8),
=0.27×10,
=2.7;

(4)2.35×0.15-0.15×0.35,
=0.15×(2.35-0.35),
=0.15×2,
=0.3.
点评:完成本题要注意分析式中数据,运用合适的简便方法计算.
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