Question

解方程，还有脱式计算，要过程，拍的清楚一些？

Answer 1

7x÷1/3=3/5

7x=3/5×1/3

7x=1/5

x=1/35

30/7x=18

x=18÷30/7

x=18×7/30

x=21/5

x-1/4x=15/4

3/4x=15/4

x=15/4÷3/4

x=5

2/5x-120×2/5=12

2/5x-48=12

2/5x=60

x=150

5/9+(3/4-1/2)

=5/9+1/4

=29/36

6/23-10/21+17/23-11/21

=(6/23+17/23)-(10/21+11/21)

=1-1

=0

7/26×13/7+27/39×13/3

=1/2+3

=3.5

11/45×27/22×1/2

=3/10×1/2

=3/20

7/12×（2/3+12/15）

=7/12×22/15

=77/90

3/11+4/17+8/11-13/17

=（3/11+8/11）-（4/17+13/17）

=1-1

=0