3) x-37_17/54=15_16/45
x-2015/54=1_16/45
x-2015/54=16/45
x=16/45+2015/54
x=10171/270
x=37_181/270
ширина- 12.6:3=4.2
S=а*бS=12.6*4.2S=52.92