简算:9/14÷(5/6-3/4)×7/24
=[84×9/14]÷[84×(5/6-3/4)]×7/24
=54÷(70-63)×7/24
=54/7 ×7/24
=9/4
2/5×101-40%
= 2/5×101-2/5
=2/5 ×(101-1)
=2/5 ×100
=40
方程 1÷(x+2/3)=4/5
5=4(x+2/3)
15=12x+8
12x=7
x=7/12
18-20%x-1/4=9
9=1/5x+1/4
180=4x+5
4x=175
x=175/4
简算:9/14÷(5/6-3/4)×7/24
=[84×9/14]÷[84×(5/6-3/4)]×7/24
=54÷(70-63)×7/24
=54/7 ×7/24
=9/4
2/5×101-40%
= 2/5×101-2/5
=2/5 ×(101-1)
=2/5 ×100
=40
方程 1÷(x+2/3)=4/5
5=4(x+2/3)
15=12x+8
12x=7
x=7/12
18-20%x-1/4=9
9=1/5x+1/4
180=4x+5
4x=175
x=175/4