能简算的要简算 5分之4除以7分之8减7分之4 (2分之1加十二分之1减12分之7)÷

2025-03-20 21:07:04
推荐回答(1个)
回答1:

4/5÷8/7-4/7(1/2+1/12-7/12)÷1/6
=4/5*7/8-4/7(1/2-6/12)÷1/6
=7/10-0=7/10;
3/7-(3/4-4/7)
=3/7+4/7-3/4
=1-3/4
=1/4;
1/4*2/5+3/5÷4
=1/4*2/5+3/5*1/4
=1/4(2/5+3/5)
=1/4