Question

Tìm x biết

A)x^3=27             B)(2x-1)^3=-8         C)(x+3)^2=49          D)(x-2)^2=36

 

 

 

Answer 1

A, a^3=27=>x=3

B, (2x-1)^3=-8=>x=-0,5

C,(x+3)^2=49=>x=4

D,(x-2)^2=36=>x=4

Answer 2

Ai làm đầu tiên mình kick cho

Answer 3

x^3=27=>x=3

b,(2x-1)^3=-8

=>2x-1=-2

=>2x=-1

x=-3/2

C(x+3)^2=49=>x+3=7

=>x+3=7=>x=4

D(x-2)^2=36=>x=6

x-2=6=>x=8

Answer 4

a) x=3

b) x=0,5

c) x=4

d) x=4

Answer 5

a) \(x^3=27\)

\(\Rightarrow3^3=27\)

\(\Rightarrow x=3\)   

b)\(\left(2x-1\right)^3=-8\)   

     \(\left(2x-1\right)^3=\left(-2\right)^3\)

\(\Rightarrow2x-1=-2\)

\(\Rightarrow x=-\frac{1}{2}\)

c)\(\left(x+3\right)^2=49\)

\(\left(x+3\right)^2=7^2\)

\(\Rightarrow x+3=7\)

\(\Rightarrow x=4\)

d) \(\left(x-2\right)^2=36\)

\(\left(x-2\right)^2=6^2\)

\(\Rightarrow x-2=6\)

\(\Rightarrow x=4\)

nha^_^

tks!!

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