Question

[Nguyen Thuy Tien]

Tìm x biết

a)\(\left(7x-11\right)^3=2^5\times5^2+200\)

b)\(3\frac{1}{3}x+16\frac{3}{4}=-13,25\)

Answer 1

[Edogawa Conan]

a) (7x - 11)³ = 2⁵ x 5² + 200

     (7x - 11)³ = 800 + 200

     (7x - 11)³ = 1000

     (7x - 11)³ = 10³

=>     7x - 11 = 10

=>            7x = 10 + 11

=>             7x = 21

=>                x =  3

b) \(3\frac{1}{3}x+16\frac{3}{4}=-13,25\)

                     \(3\frac{1}{3}x=-13,25-16\frac{3}{4}\)

                     \(\frac{10}{3}x=-30\)

                             \(x=-9\)

Answer 2

[trường nguyễn]

a, x= 3

b, -9