Question

Помогите решить уравнения! !! 1) (900-х÷6)×5=4200. 2) 325+(90-n) ÷17=330.

Answer 1

(900-х:6) * 5 = 4200
900 - х:6 = 4200 :5
900 - х :6 = 840
х:6 = 900 - 840
х :6 = 60
х = 60 * 6
х = 360

 325 + (90-n ) : 17 = 330
(90 - n)  :17 = 330 - 325
(90 - n)  :17 = 5
90 - n  = 5 * 17
90 - n = 85
n = 90 - 85
n = 5

Answer 2

(900- x÷6)×5=4200
900-x÷6=4200÷5
900-x÷6=840
x÷6=900-840
x÷6=60
x=60×6
x=360

326+(90-n)÷17=330
(90-n)÷17=330-326
(90-n)÷17=4
90-n=17×4
90-n=68
n=90-68
n=22