Question

用方程和脱式计算下列各题9X+7=21.4 X+1/7=2/5 8X-4=24 X-1/9=1/36X+3X=63 5/

Answer 1

9X+7=21.4

9x=14.4

x=1.6

X+1/7=2/5

x=2/5-1/7

x=9/35

8X-4=24

8x=28

x=3.5

X-1/9=1/3

x=1/3-1/9

x=4/9

6X+3X=63

9x=63

x=7

5/3-（2/3-1/8）

=5/3-2/3+1/8

=1+1/8

=9/8

1-2/9-1/6

=7/9-1/6

=11/18

15/16-3/8+1/16

=15/16+1/16-3/8

=1-3/8

=5/8