25-3.6*1.5+2.5=25-5.4+2.5=22.1
(25-3.6) (1.5+2,5)=21.4*4=85,6
25-3.6(1.5+2.5)=25-14.4=10.6
599-597=2+595=597-593=4+507=511-505=506+503=509-501=8
Ответ: 8
51:7=8(ост.2)
Проверка:7*8=49
59:9=6(ост.5)
Проверка:9*6=54
<span> 0,25*(9,1х-5,5х)=63:1000
2.275x-1.375x=63:1000
0.9x=0.063
x=0.063/0.9
x=0.07</span>