题目内容
根据运算定律,在里填上合适的数.
(1)6.1×4.5+3.9×4.5=(+3.9)×
(2)0.69×101=×+×
(1)6.1×4.5+3.9×4.5=(+3.9)×
(2)0.69×101=×+×
分析:(1)根据乘法分配律进行简算;
(2)101=100+1,然后再根据乘法分配律进行简算.
(2)101=100+1,然后再根据乘法分配律进行简算.
解答:解:
(1)6.1×4.5+3.9×4.5,
=(6.1+3.9)×4.5,
=10×4.5,
=45;
(2)0.69×101,
=0.69×(100+1),
=0.69×100+0.69×1,
=69+0.69,
=69.69.
故答案为:6.1,4.5,0.69,100,0.69,1.
(1)6.1×4.5+3.9×4.5,
=(6.1+3.9)×4.5,
=10×4.5,
=45;
(2)0.69×101,
=0.69×(100+1),
=0.69×100+0.69×1,
=69+0.69,
=69.69.
故答案为:6.1,4.5,0.69,100,0.69,1.
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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