Question

728+X=500×2+15
X-39=360÷4+1
(100-X÷4)-30=54​

Answer 1

Пошаговое объяснение:

728 + х = 500 * 2 + 15

728 + х = 1000 + 15

728 + х = 1015

х = 1015 - 728

х = 287

х - 39 = 360 : 4 + 1

х - 39 = 90 + 1

х - 39 = 91

х = 91 + 39

х = 130

(100 - х : 4) - 30 = 54

100 - х : 4 = 54 + 30

100 - х : 4 = 84

х : 4 = 100 - 84

х : 4 = 16

х = 16 * 4

х = 64