Bài 1. Tìm x a) x + 12 = 36 b) x x 6 = 30 c) x – 25 = 15 d) x : 7 = 5 e) 80 – x = 30 g) 42 : x = 7
Câu 1. Tìm x
a) x + 12 = 36 b) x x 6 = 30
c) x – 25 = 15 d) x : 7 = 5
e) 80 – x = 30 g) 42 : x = 7
Giải:
a) x + 12 = 36
x = 36 – 12
x = 24
b) x x 6 = 30
x = 30 : 6
x = 6
c) x : 7 = 5
x = 7 x 5
x = 35
d) 42 : x =7
x = 42 :
x = 6
e) x – 25 = 15
x = 15 + 25
x = 40
f) 80 – x = 30
x = 80 – 30
x = 50