题目内容
下面各题,怎样算简便就怎样算
102×4.5 | 0.25×4.8 | 4.25×3.7-0.37×32.5 |
5.23×4+4.77÷0.25 | 6.67-(4.54-3.33) | 28.6×101-28.6. |
分析:(1)可将102拆分为100+2后根据乘法分配律计算;
(2)可将4.8拆分为4×1.2后计算;
(3)可将4.25×3.7变为42.5×0.37后根据乘法分配律计算;
(4)可将式中的除法算式变为乘法算式后,根据乘法分配律计算;
(5)可根据一个数减两个数的差,等于减去两个数中的被减数,加上减数的减法性质计算;
(6)可将101拆分为100+1后根据乘法分配律计算.
(2)可将4.8拆分为4×1.2后计算;
(3)可将4.25×3.7变为42.5×0.37后根据乘法分配律计算;
(4)可将式中的除法算式变为乘法算式后,根据乘法分配律计算;
(5)可根据一个数减两个数的差,等于减去两个数中的被减数,加上减数的减法性质计算;
(6)可将101拆分为100+1后根据乘法分配律计算.
解答:解:(1)102×4.5
=(100+2)×4.5,
=100×4.5+2×4.5,
=450+9,
=459;
(2)0.25×4.8
=0.25×4×1.2,
=1×1.2,
=1.2;
(3)4.25×3.7-0.37×32.5
=42.5×0.37-0.37×32.5,
=(42.5-32.5)×0.37,
=10×0.37,
=3.7;
(4)5.23×4+4.77÷0.25
=5.23×4+4.77÷
,
=5.23×4+4.77×4,
=(5.23+4.77)×4,
=10×4,
=40;
(5)6.67-(4.54-3.33)
=6.67+3.33-4.54,
=10-4.54,
=5.46;
(4)28.6×101-28.6
=28.6×(100+1)-28.6,
=28.6×100+28.6×1-28.6,
=2860+(28.6-28.6),
=2860+0,
=2860.
=(100+2)×4.5,
=100×4.5+2×4.5,
=450+9,
=459;
(2)0.25×4.8
=0.25×4×1.2,
=1×1.2,
=1.2;
(3)4.25×3.7-0.37×32.5
=42.5×0.37-0.37×32.5,
=(42.5-32.5)×0.37,
=10×0.37,
=3.7;
(4)5.23×4+4.77÷0.25
=5.23×4+4.77÷
1 |
4 |
=5.23×4+4.77×4,
=(5.23+4.77)×4,
=10×4,
=40;
(5)6.67-(4.54-3.33)
=6.67+3.33-4.54,
=10-4.54,
=5.46;
(4)28.6×101-28.6
=28.6×(100+1)-28.6,
=28.6×100+28.6×1-28.6,
=2860+(28.6-28.6),
=2860+0,
=2860.
点评:完成本题要注意分析式中数据的特点,运用合适的方法进行计算.
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