1) 32 : b = 64 : 8
b = 4
2) y : 4 = 49 : 7
y = 28
3) 380 - b = 330 - 175
b = 225
4) m + 32 = 158 - 143
m = - 17
По теореме Пифагора
AB^2=AC^2+BC^2
AB^2=625+3600
AB^2=4225
AB=65 см