Question

решите дроби
2/5+17/20
2/5+7/10
2/5+2 4/5
2/5+2/3
2/5+6/25

Answer 1

=8/20+17/20=25/20=5/4=1ц1/4
=4/10+7/10=11/10=1ц1/10
=3ц1/5
=6/15+10/15=16/15=1ц1/15
=10/25+6/25=16/25