6月2日奥数题分析如下:
1/2×0.125+10.5×12.5%-1÷8
通过观察,发现这道计算题,稍稍转化一下,就能变出相同的数0.125(12.5%=0.125 1÷8=0.125),这时就满足乘法分配律了。用乘法分配律就能又快又对地计算出结果了。
1/2×0.125+10.5×12.5%-1÷8
=0.5×0.125+10.5×0.125-0.125
=0.125×(0.5+10.5-1)
=0.125×10
=1.25
6月2日奥数题分析如下:
1/2×0.125+10.5×12.5%-1÷8
通过观察,发现这道计算题,稍稍转化一下,就能变出相同的数0.125(12.5%=0.125 1÷8=0.125),这时就满足乘法分配律了。用乘法分配律就能又快又对地计算出结果了。
1/2×0.125+10.5×12.5%-1÷8
=0.5×0.125+10.5×0.125-0.125
=0.125×(0.5+10.5-1)
=0.125×10
=1.25