9分之7 40分之1 8分之3 7分之5等于几分之几

2025-01-02 20:02:00
推荐回答(1个)
回答1:

7/9+1/40+3/8+5/7
=(7x7x40+7x9+3x5x7x9+5x40x9)/(40x9x7)
=(1960+63+945+1800)/2520
=4768/2520
=2389/504
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