Question

Bài 3. Tìm số tự nhiên x, biết:

a) 150 – x = - 9 b) 4(x – 3) = 48 c) 71 – (33 + x) = 26 d) 2(x – 51) = 2.23 + 20 e) 450 : (x – 19) = 50 f) 135 – 5(x + 4) = 35 g) (15 – 6x). 35 = 36

h) 32(x + 4) – 52  = 5.22 i) 4 – ( 7 – x) = 2x – ( 13 – 4) k) ( 7 – x) – ( 25 + 7 ) = - 25 l) 7x – x = 521 : 519 + 3.22 – 70 m) 2x+1  – 2 = 14 o) 4x + 4x+1 = 320 p) ( 2x +1)3 = 125 q) (x - 2)2 = ( x – 2)5

Answer 1

a) 150- x = -9

x = 150 -(-9)

x=150+9

x=159

b)4 (x-3)=48

x-3=48÷4

x-3=12

x=12+3

x=15