Решите уравнение b+13,7=12 19/50+5,65
B+13.7=12 19/50+5.65 b+13.7=619/50+565/100 b+13.7=1238/100+565/100 b=1803/100-137/10 b=1803/100-1370/100 b=433/100 b=4.33