Решить уравнения 10 х х = 8 х 25 х ; 20 = 4800: 80 (х - 380) х 50 = 2000 (х + 8) ; 70 = 4 640 : (25 - х)= 40 2700 : (х-12) = 90

10*x=8*25
10*x=200
x=20

x:20=4800:80
x:20=60
x=120

(x-380)*50=2000
50x-19 000=2000
50x=21 000
x=21 000/50
x= 420

(x+8):70=4
(x+8)=280
x=272

640:(25-x)=40
25-x=640:40
25-x=16
x=9

2700:(x-12)=90
x-12=2700:90
x-12=30
x=42