7分之1÷23+7分之1×17分之9+17分之9 (要简便计算)
问题描述:
7分之1÷23+7分之1×17分之9+17分之9 (要简便计算)
急.
还有一题:(17分之9+3分之1)÷3分之1-3分之1
答
1/7÷23+1/7×9/17
=1/7×1/23+1/7×9/17
=1/7×(1/23+9/17)
=1/7×224/391
=224/2737
=32/391
(9/17+1/3)÷1/3-1/3
=44/51×3-1/3
=132/51-1/3
=115/51