递等式,一步一步来,不用简便运算
问题描述:
递等式,一步一步来,不用简便运算
(1)5/6÷5×1/5+7/9×9/4 (2)4/5÷7/9×9/8+1/5 (3)2/9-7/16×2/9 (4)24÷7/6+3/5
答
(1)5/6÷5×1/5+7/9×9/4 (2)4/5÷7/9×9/8+1/5 =5/6*1/5*1/5+7/9*9*4 =4/5*9/7*9/8+1/5=1/30+7/4 =81/70+1/5=2/60+105/60 =81/70+14/70=107/60 =95/70=19/143)2/9-7/16×2/9 (4)24÷7/6+3/5 =2/9-7/72 =...