4/5=24/30 1/6=5/30 3/10=9/30你代进去,最后除法可以变乘法,也就是乘以30,结果为10
如图
3/10原式=1/3-1/4+1/4-1/5+1/5-1/6++1/29-1/30=1/3-1/30=3/10
(4/5-1/6-3/10)÷1/30
=(4/5-1/6-3/10)x30
=4/5x30-1/6x30-3/10x30
=24-5-9
=24-(5+9)
=24-14
=10
(4/5-1/6-3/10)÷1/30
=(4/5-1/6-3/10)*30
=4/5*30-1/6*30-3/10*30
=24-5-9
=24-(5+9)
=24-14
=10