题目内容
计算下面各题(能简算的要简算) (1)7.05×23.7+7.05×76.3 |
(2)0.125×3.2×2.5 | (3)7.8-1.9+8.2-8.1 |
(4)44.28÷0.9÷4.1 | (5)9.07-22.78÷3.4 | (6)2.05÷0.82﹢33.6. |
分析:算式(1)可据分配律进行简算;算式(2)可用拆分法进行简算;算式(3)可用交换律进行简算;其余三个算式据四则混合运算法则计算即可.
解答:解:(1)7.05×23.7+7.05×76.3
=(23.7+76.3)×7.05,
=100×7.05,
=705;
(2)0.125×3.2×2.5
=(0.125×8)×(0.4×2.5),
=1×1,
=1;
(3)7.8-1.9+8.2-8.1
=(7.8+8.2)-(1.9+8.1),
=16-10,
=6;
(4)44.28÷0.9÷4.1
=49.2÷4.1,
=12;
(5)9.07-22.78÷3.4
=9.07-6.7,
=2.37;
(6)2.05÷0.82﹢33.6
=2.5+33.6,
=36.1.
=(23.7+76.3)×7.05,
=100×7.05,
=705;
(2)0.125×3.2×2.5
=(0.125×8)×(0.4×2.5),
=1×1,
=1;
(3)7.8-1.9+8.2-8.1
=(7.8+8.2)-(1.9+8.1),
=16-10,
=6;
(4)44.28÷0.9÷4.1
=49.2÷4.1,
=12;
(5)9.07-22.78÷3.4
=9.07-6.7,
=2.37;
(6)2.05÷0.82﹢33.6
=2.5+33.6,
=36.1.
点评:完成有关小数的四则混合运算时,加减法要注意小数点的对齐,乘除法要注意小数位置的移动.

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