题目内容
能用简便方法的用简便方法计算
6.48×909+6.48; 6.8×9.9.
6.48×909+6.48; 6.8×9.9.
分析:(1)运用乘法分配律简算;
(2)把9.9看作10-0.1,运用乘法分配律简算.
(2)把9.9看作10-0.1,运用乘法分配律简算.
解答:解:(1)6.48×909+6.48
=6.48×(909+1)
=6.48×910
=5896.8
(2)6.8×9.9
=6.8×(10-0.1)
=6.8×10-6.8×0.1
=68-0.68
=67.32
=6.48×(909+1)
=6.48×910
=5896.8
(2)6.8×9.9
=6.8×(10-0.1)
=6.8×10-6.8×0.1
=68-0.68
=67.32
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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