> 数学 >
计算下面个题,能简算的要简算.
7.2乘9.9除0.25


666乘9加46乘111
人气:316 ℃ 时间:2020-03-21 09:13:13
解答
7.2乘9.9除0.25
=7.2×(10-0.1)÷0.25
=(72-0.72)×4
=288-2.88
=285.12;
666乘9加46乘111
=111×6×9+46×111
=111×(54+46)
=111×100
=11100
如果本题有什么不明白可以追问,7.2乘9.9除0.25=7.2×(10-0.1)÷0.25=(72-0.72)×4=288-2.88=285.12这个里的2.88哪里来的?72×4=288;0.72×4=0.01×72×4=0.01×288=2.88;
推荐
猜你喜欢
© 2024 79432.Com All Rights Reserved.
电脑版|手机版