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1) 2/7+3/7=5/7

2) 5/12+2/3=

=5/12+8/12=13/12

3) 19/24-1/12=

=19/24-2/24=17/24

4) 17/32-5/16=

=17/32-10/32=7/32

5) 2/7×3/4=

=1/7×3/2=3/14

6) 12/35×5/14=

=6/5×1/7=6/35

7) 7/8:2/20=

=7/8:1/10=

=7/8×10=

=7/4×5=35/4

8) 24/27:12/54=

=8/9:2/9=

=8/9×9/2=4