А) 5,23 + х = - 7,24
х = -7,24 - 5,23
х = - 12,47
б) у - 2.5/12 = - 3.7/15
у = -3.7/15 + 2.5/12 = - 52/15 + 29/12 = 4*(-52)/60 + 5*(29)/60 =(-208+145)/60= =-63/60 = - 1.3/60 = - 1.1/20
y = -1.1/20
36:4х(25+7)=288
1)36:4=9
2)625+7=32
3)32х9=288
#10.
А) 0,604 * 87=52,548
Б)