4/3х + 4 + 5 - 8/5х = 1
20х + 60 + 75 - 24х = 15
-4х = -60 - 75 + 15
-4х = -120
4х = 120
<u> х = 30</u>
Проверка:
120 : 3 + 4 + 5 - 240 : 5 = 1
40 + 4 + 5 - 48 = 1
49 - 48 = 1
1 = 1.
5x-8+3-x-2x-7=0
2x=15
x=7.5
Б)49.2÷12.3×100%=400%
а)12.3÷49.2×100%=25%
в)40÷0.04×100%=100000%.