1、

4/7+x= 1 1/ 14

x= 1 1/ 14-4/7

x = 1 1/ 14-8/ 14

x=3/ 14

x+6/ 15=3/5

x+2/5=3/5

x=3/5-2/5

x= 1/5

x-2/9=5/6

x-4/ 18= 15/ 18

x=4/ 18+ 15/ 18

x= 19/ 18

1+x- 1/6 = 1 1/ 12

x+5/6= 1 1/ 12

x+ 10/ 12 = 1 1/ 12

x = 1 1/ 12- 10/ 12

x= 1/ 12

7/8+x-3/4=3/5

x+7/8-6/8=3/5

x+ 1/8=3/5

x=3/5- 1/8

x= 12/40-5/40

x=7/40

2、

& gt，& gt，& lt

=，& gt，& lt

3、

5/6+4/ 15+ 1/6-2/ 15

=5/6+ 1/6+4/ 15-2/ 15

= 1+2/ 15

= 17/ 15

7/ 12-3/8- 1/ 12+3/8

=7/ 12- 1/ 12+3/8-3/8

=6/ 12

= 1/2

1-2/9- 1/6+2/9

= 1- 1/6+2/9-2/9

=5/6

7/8-4/ 15+ 1/8- 1/ 15

=7/8+ 1/8-(4/ 15+ 1/ 15)

= 1-5/ 15

= 1- 1/3

=2/3

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