Question

Решил уравнения: 10×x= 8×25, x÷20=4800÷80, (x-380)×50= 2000, (x+8)÷70= 4, 640÷(25-x) = 40, 2700÷(x-12)= 90

Answer 1

1)х= 4*2*5*5 / 10 =200/10=20
2)x = 4800/80*20 = 600*20 = 12000
3) x-380 = 2000/50
     x = 40 +380 = 420
4) x +8 = 4*80
     x = 320 - 8 = 312
5)640 = 40* (25-x)
   640/ 40 - 25 = x
   x= 16-25 = - 9
6) 2700/90 = x-12
     x = 30+12 = 42