Question

分数,要地等式要通分过程.2/3+6/5.4/5-3/8.7/20-2/15.1/2+1/3.4/5-2/15

Answer 1

2/3+6/5.

=10/15+12/15

=22/15

4/5-3/8.

=32/40-15/40

=17/40

7/20-2/15.

=21/60-8/60

=13/60

1/2+1/3.

=3/6+2/6

=5/6

4/5-2/15

=12/15-2/15

=10/15

=2/3