(1/4-1/15*2)÷2/5
=(1/4-2/15)x5/2
=1/4x5/2-2/15x5/2
=5/8-1/3
=7/24
4/7*(1÷3/4-3/4÷1)
=4/7x(4/3-3/4)
=4/7x7/12
=1/3
(1/4-1/15*2)÷2/5、4/7*(1÷3/4-3/4÷1)简算
(1/4-1/15*2)÷2/5、4/7*(1÷3/4-3/4÷1)简算
数学人气:581 ℃时间:2020-03-28 10:47:57
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