Question

a)(123-4x)-67=8

b)(2².|x|-5²).3⁸=3⁹

c)x-12= -28

d)20+2³. x=5².4

Answer 1

a)123-4x=8+67

123-4x=75

4x=123-75

4x=48

x=48:4

x=12

Answer 2

b)4.|x|-25=3⁹:3⁸

4.|x|-25=3¹(=3)

4.|x|=3+25

4.|x|=28

|x|=28:4

|x|=7

TH1: TH2:

x=7 x=-7

vậy x E(dấu thuộc nha) (7;-7)

Answer 3

c: x=-28+12=-16

d: =>8x+20=100

=>8x=80

=>x=10