1.=10 7/10+х+2/5=107/10+х+4/10=111/10+х.111/10+9/10=120/10=12111/10+2/5=111/10+4/10=115/10=11 5/10==11 1/22.25 6/7-х-5/14=181/7-х-5/14=362/14-5/14-х==357/14-х357/14-5 1/2=357/14-11/2=357/14-77/14==280/14=20357/14-3/4=714/28-21/28=686/28=24 1/23.х+3/5-17/30=х+18/30-17/30=х+1/306+1/30=6 1/307/10+1/30=21/30+1/30=22/30=11/15