题目内容
递等式计算.(能用简便算法的用简便方法计算)
1.5×105; | 2.33×0.5×4 |
2.05÷0.82+33.6 | 9.07-22.78÷3.4. |
分析:(1)可将105拆分为100+5后根据乘法分配律计算;
(2)可根据乘法结合律计算;
(3)(4)根据四则混合运算的运算顺序计算即可,先算乘除,再算加减.
(2)可根据乘法结合律计算;
(3)(4)根据四则混合运算的运算顺序计算即可,先算乘除,再算加减.
解答:解:(1)1.5×105
=1.5×(100+5),
=1.5×100+1.5×5,
=150+7.5,
=157.5;
(2)2.33×0.5×4
=2.33×(0.5×4),
=2.33×2,
=4.66;
(3)2.05÷0.82+33.6
=2.5+33.6,
=36.1;
(4)9.07-22.78÷3.4
=9.07-6.7,
=2.37.
=1.5×(100+5),
=1.5×100+1.5×5,
=150+7.5,
=157.5;
(2)2.33×0.5×4
=2.33×(0.5×4),
=2.33×2,
=4.66;
(3)2.05÷0.82+33.6
=2.5+33.6,
=36.1;
(4)9.07-22.78÷3.4
=9.07-6.7,
=2.37.
点评:完成本题要注意分析式中数的据的特点及内在联系,然后运用合适的方法进行计算.
练习册系列答案
相关题目