945 : (4у-43) = 31
(4у-43) = 945 : 31
(4у-43) = 30.48387
4у - 43 = 30,48387
4у = 43 + 30,48387
4у = 73,48387
у = 73,48387 : 4
у = 18,370967
1)3/4 * 1/9=1/12.
2)2/5 * 1/10=1/25.
3) 11/15 * 1/22=1/30.
4) 4/7 * 1/2=2/7.
5) 15/7 * 1/15=1/7.
6)16/9 * 1/8=2/9.