3 4 8- + - / -7 7 9哎呀,就是7 - 知识问答

3 4 8- + - / -7 7 9哎呀,就是7分之3加7分之4除以9分之83/7 + 4/7 ÷ 8/9

1个回答

3/7 + 4/7 ÷ 8/9
=3/7 + 4/7 X 9/8
=3/7 + (4X9)/(7X8)
=3/7 + 36/56
=(3X8)/(7X8)+36/56
=24/56+36/56
=60/56
=15/14
=1又14分之1
做这道题关键在于4/7 ÷ 8/9=4/7 X 9/8
还有先乘除后加减明白了吗?
^__________^

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