题目内容
能简算的要简算. 9.02-22.78÷3.4 |
1.08×2.4÷0.27 | 4.75×2.6+3.4×4.75 |
5.8×99 | 1.25×2.5×0.32. |
分析:(1)先算除法,再算减法.
(2)运用乘法交换律进行计算.
(3)根据乘法分配律进行计算.
(4)把99转化为100-1再根据乘法分配律进行计算.
(5)把0.32分解成0.8×0.4,再根据乘法交换律和乘法分配律进行计算.
(2)运用乘法交换律进行计算.
(3)根据乘法分配律进行计算.
(4)把99转化为100-1再根据乘法分配律进行计算.
(5)把0.32分解成0.8×0.4,再根据乘法交换律和乘法分配律进行计算.
解答:解:(1)9.02-22.78÷3.4
=9.02-6.7
=2.32;
(2)1.08×2.4÷0.27
=1.08÷0.27×2.4
=0.4×2.4
=0.96;
(3)4.75×2.6+3.4×4.75
=4.75×(2.6+3.4)
=4.75×6
=28.5;
(4)5.8×99
=5.8×(100-1)
=5.8×100-5.8
=580-5.8
=574.2;
(5)1.25×2.5×0.32
=1.25×2.5×0.8×0.4
=(1.25×0.8)×(2.5×0.4)
=1×1
=1.
=9.02-6.7
=2.32;
(2)1.08×2.4÷0.27
=1.08÷0.27×2.4
=0.4×2.4
=0.96;
(3)4.75×2.6+3.4×4.75
=4.75×(2.6+3.4)
=4.75×6
=28.5;
(4)5.8×99
=5.8×(100-1)
=5.8×100-5.8
=580-5.8
=574.2;
(5)1.25×2.5×0.32
=1.25×2.5×0.8×0.4
=(1.25×0.8)×(2.5×0.4)
=1×1
=1.
点评:本题主要考查了学生根据题目特点,在小数四则运算中灵活运用简便方法进行计算的计算能力.
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