Question

243-4*(2x+17)=18

x*x^3=81

(7x+6)*5^5=5^8

Answer 1

x*x^3 = 81

x^4 = 81

Mà có : 81 = 3^4

=> x =4

Answer 2

243-4*(2x+17)=18

4*(2x+17)=243-18

4*(2x+17)=225

2x+17=225:4

2x+17=225/4

2x=225/4 - 17

   2x = 175/4

  x =175/4 : 2

  x = 175/8

Answer 3

cảm ơn bạn

Answer 4

(7x+6)*5^5=5^8

7x+6= 5^8:5^5

7x+6=5^3

7x +6 = 125

7x = 125 -6

7x =119

x=119:7 =17