Решите уравнения:
1) 5 3/7-(b-2 1/7)=2 4/7
2) (270:y-12)*70=1260
1) 5 3/7-(b-2 1/7)=2 4/7
38/7 - b + 15/7 = 18/ 7
b = 38/7 + 15/7 -18/7
b = 38+15-18 /7
b = 35/7
b = 5
2) (270:y-12)*70=1260
(270:y-12)=1260÷70
270÷y-12= 18
270÷y = 18+12
270÷y = 30
y = 270÷30
y = 9
Оцени ответ
