Question

a) (9x + 2) x 3= 60

b) 71+(26-3x):5=75

c) (x-6)^2 = 9

d) 1+3+.......+x= 465

e)2^x=3^2

h)16:x-1

g) 5^2x-3=5^2x3

Answer 1

a)(9x+2)x3=60

        9x+2 =60:3

        9x+2  =20

              9x =20-2

              9x=18

                x=18:9

                 x=2

Answer 2

a,x=2

b,x=2

c,x=9

Answer 3

o phan a 

(9x+2)*3=60

9x+2=20

9x=18

x=2

o phan b

71+(26-3x)/5=75

(26-3x)/5=75-71=4

26-3x=4*5=20

3x=26-20=6

x=6/3=2

vay x=2

o phan c 

(x-6)^2=9

(x-6)^2=3^2

=>x-6=3

=>x=9

vay x =9

ở phần d 

1+3+.....+x=465

=>(x+1)*(x-1)/2+(x+1)=465

=>(x+1)*(x-1)/2