题目内容
简便运算.
3.1×2.5×4 | 5.3÷0.25÷4 | 5.2×0.5×0.2. |
分析:(1)运用乘法的结合律进行简算;
(2)运用除法的性质进行简算;
(3)运用乘法的结合律进行简算.
(2)运用除法的性质进行简算;
(3)运用乘法的结合律进行简算.
解答:解:(1)3.1×2.5×4
=3.1×(2.5×4)
=3.1×10
=31;
(2)5.3÷0.25÷4
=5.3÷(0.25×4)
=5.3÷1
=5.3;
(3)5.2×0.5×0.2
=5.2×(0.5×0.2)
=5.2×0.1
=0.52.
=3.1×(2.5×4)
=3.1×10
=31;
(2)5.3÷0.25÷4
=5.3÷(0.25×4)
=5.3÷1
=5.3;
(3)5.2×0.5×0.2
=5.2×(0.5×0.2)
=5.2×0.1
=0.52.
点评:本题考查了四则混合运算,注意运算顺序和运算法则,灵活运用所学的运算定律进行简便计算.
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