> 数学 >
简便计算:1/30+1/42+1/56+1/72=
人气:353 ℃ 时间:2020-01-14 13:03:07
解答
=1/5×6+1/6×7+1/7×8-1/8×9
=1/5-1/6+1/6-1/7+1/7-1/8+1/8-1/9
=1/5-1/9
=4/45
推荐
猜你喜欢
© 2025 79432.Com All Rights Reserved.
电脑版|手机版