题目内容
用简便方法进行计算.
1.25×3.9×2.4 | 0.88×99+0.88 | 0.98-0.036-0.264. |
分析:(1)把2.4拆成0.8×3,利用乘法交换律和结合律计算即可;
(2)利用乘法分配律简算;
(3)利用减法的性质简算.
(2)利用乘法分配律简算;
(3)利用减法的性质简算.
解答:解:(1)1.25×3.9×2.4
=1.25×0.8×(3×3.9)
=1×11.7
=11.7;
(2)0.88×99+0.88
=0.88×(99+1)
=0.88×100
=88;
(2)0.98-0.036-0.264
=0.98-(0.036+0.264)
=0.98-0.3
=0.68.
=1.25×0.8×(3×3.9)
=1×11.7
=11.7;
(2)0.88×99+0.88
=0.88×(99+1)
=0.88×100
=88;
(2)0.98-0.036-0.264
=0.98-(0.036+0.264)
=0.98-0.3
=0.68.
点评:此题考查简便运算,根据数字特点选择适当的方法和运算定律简算.
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