题目内容
计算下面各题,能简便的要简便. 5.6+0.82+4.4+0.18 |
70÷3.5+4.5×1.6 |
0.25×0.73×4 | 7.6×0.8+0.2×7.6 |
7.75×〔20÷(3.24-3.04)〕 | 63.4÷2.5÷0.4. |
分析:(1)利用加法交换律与结合律简算;
(2)先算除法和乘法,再算加法;
(3)利用乘法交换律简算;
(4)利用乘法分配律简算;
(5)先算减法,再算除法,最后算乘法;
(6)利用除法的性质简算.
(2)先算除法和乘法,再算加法;
(3)利用乘法交换律简算;
(4)利用乘法分配律简算;
(5)先算减法,再算除法,最后算乘法;
(6)利用除法的性质简算.
解答:解:(1)5.6+0.82+4.4+0.18
=5.6+4.4+(0.18+0.82)
=10+1
=11;
(2)70÷3.5+4.5×1.6
=20+7.2
=27.2;
(3)0.25×0.73×4
=0.25×4×0.73
=1×0.73
=0.73;
(4)7.6×0.8+0.2×7.6
=(0.8+0.2)×7.6
=1×7.6
=7.6;
(5)7.75×[20÷(3.24-3.04)]
=7.75×[20÷0.2]
=7.75×100
=775;
(6)63.4÷2.5÷0.4
=63.4÷(2.5×0.4)
=63.4÷1
=63.4.
=5.6+4.4+(0.18+0.82)
=10+1
=11;
(2)70÷3.5+4.5×1.6
=20+7.2
=27.2;
(3)0.25×0.73×4
=0.25×4×0.73
=1×0.73
=0.73;
(4)7.6×0.8+0.2×7.6
=(0.8+0.2)×7.6
=1×7.6
=7.6;
(5)7.75×[20÷(3.24-3.04)]
=7.75×[20÷0.2]
=7.75×100
=775;
(6)63.4÷2.5÷0.4
=63.4÷(2.5×0.4)
=63.4÷1
=63.4.
点评:此题考查小数的混合运算顺序,注意运算定律的运用,使计算简便.
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