题目内容
用简便方法进行计算 17.17-6.8-3.2-6.17 |
2.8×3.5+3.5×18.2-3.5 | 5.4×101. |
分析:(1)根据减法的性质简算;
(2)运用乘法分配律简算;
(3)先把101分解成100+1,再运用乘法分配律简算.
(2)运用乘法分配律简算;
(3)先把101分解成100+1,再运用乘法分配律简算.
解答:解:(1)17.17-6.8-3.2-6.17,
=(17.17-6.17)-(6.8+3.2),
=11-10,
=1;
(2)2.8×3.5+3.5×18.2-3.5,
=3.5×(2.8+18.2-1),
=3.5×20,
=70;
(3)5.4×101,
=5.4×(100+1),
=5.4×100+5.4×1,
=540+5.4,
=545.4.
=(17.17-6.17)-(6.8+3.2),
=11-10,
=1;
(2)2.8×3.5+3.5×18.2-3.5,
=3.5×(2.8+18.2-1),
=3.5×20,
=70;
(3)5.4×101,
=5.4×(100+1),
=5.4×100+5.4×1,
=540+5.4,
=545.4.
点评:完成本题要注意分析式中数据,运用合适的简便方法计算.
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