题目内容
脱式计算.(能简算的要简算) 3.5×0.16÷0.8= |
2.1÷0.25×4= | 93÷0.31÷3 |
46.69÷2.3÷0.5 | 92÷8÷1.25 | 0.252÷1.2÷0.05. |
分析:(1)可根据乘法结合律计算;
(2)(4)按从左到右的顺序计算即可;
(3)(5)(6)可根据一个除以两个数,等于用这个数除以这两个数的积的除法性质进行计算;
(2)(4)按从左到右的顺序计算即可;
(3)(5)(6)可根据一个除以两个数,等于用这个数除以这两个数的积的除法性质进行计算;
解答:解:(1)3.5×0.16÷0.8
=3.5×(0.16÷0.8),
=3.5×0.2,
=0.7;
(2)2.1÷0.25×4
=8.4×4.
=33.6;
(3)93÷0.31÷3
=93×(0.31×3),
=93÷0.93,
=100;
(4)46.69÷2.3÷0.5
=20.3÷0.5,
=40.6;
(5)92÷8÷1.25
=92÷(8×1.25),
=92÷10,
=9.2;
(6)0.252÷1.2÷0.05
=0.252÷(1.2×0.05),
=0.252÷0.06,
=4.2.
=3.5×(0.16÷0.8),
=3.5×0.2,
=0.7;
(2)2.1÷0.25×4
=8.4×4.
=33.6;
(3)93÷0.31÷3
=93×(0.31×3),
=93÷0.93,
=100;
(4)46.69÷2.3÷0.5
=20.3÷0.5,
=40.6;
(5)92÷8÷1.25
=92÷(8×1.25),
=92÷10,
=9.2;
(6)0.252÷1.2÷0.05
=0.252÷(1.2×0.05),
=0.252÷0.06,
=4.2.
点评:完成本题要注意分析式中数的据的特点,运用合适的方法进行计算,同时要注意小数点位置的变化.
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