34×(1/17+1/19)×19 和 3/5+[(1/5+1/3)÷2/9] 怎么算?(能简算的要简算)
人气:250 ℃ 时间:2020-04-04 08:07:28
解答
怎么算?(能简算的要简算)
34×(1/17+1/19)×19
解,得:
==19*34*1/17+19*34*1/19
==19*2+34
==38+34
==72
3/5+[(1/5+1/3)÷2/9]
解,得:
==3/5+8/15*9/2
==3/5+12/5
==15/5
==3
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