А)26+x*3=50 д)9*9-540:(а-27)=15*5
x*3=50-26 81-540:(а-27)=75
x*3=24 540:(а-27)=81-75
x=8 540:(а-27)=6
26+8*3=26+24=50 а-27=540:6
а-27=90
b)480:y-19=41 а=90+27
480:у=41+19 а=117
480:у=60 9*9-540:(117-27)=15*5
у=480:60 81-540:90=81-6=75=75
у=8
480:8-19=60-19=41 ж)6 1/7-(с+2 4/7)=2 5/7
с+2 4/7=6 1/7-2 5/7
в)160/t+18=25*2 с+2 4/7=3 3/7
160/t+18=50 с=3 3/7-2 4/7
160/t=50-18 6/7 с=
160/t=32 6 1/7-(6/7+2 4/7)=6 1/7-3 3/7=2 5/7
t=160:32 з)3 5/16+(d-1 7/160=9 1/16
t=5 d- 1 7/16=9 1/16-3 5/16
160/5+18=25*2=32+18=50=50 d-1 7/16=5 12/16
d=5 12/16+1 7/16
г)к/7-34=78:3 d=7 3/16
к/7-34=26 3 5/16+(7 3/16-1 7/16)=3 5/16+
+5 12/16=8 17/16=9 1/16
к/7=26+34
к/7=60
к=60*7
к=420
420/7-34=78:3=60-24=26=26