420 + 65.4 = (x + 175) : 5 + 30.
Giải thích
420 + 65. 4 = (x + 175) : 5 + 30
(x +175) : 5 + 30 = 420 + 260
(x + 175) : 5 + 30 = 680
(x + 175) : 5 = 680 – 30
(x + 175) : 5 = 650
x + 175 = 650 . 5
x + 175 = 3250
x = 3250 – 175
x = 3075.
Vậy x = 3075.
420 + 65. 4 = (x + 175) : 5 + 30
(x +175) : 5 + 30 = 420 + 260
(x + 175) : 5 + 30 = 680
(x + 175) : 5 = 680 – 30
(x + 175) : 5 = 650
x + 175 = 650 . 5
x + 175 = 3250
x = 3250 – 175
x = 3075.
Vậy x = 3075.