Question

Tìm x

45 - 3 x ( x + 2 ) = 2³ x 3

Answer 1

45 - 3 x (x+2) = 8 x 3 = 24

3 x (x+2) = 45 - 24 = 21

x+2 = 21 : 3 = 7

x = 7-2 = 5

k mk nha

Answer 2

3 x (x+2) = 45 - 24 = 21
x+2 = 21 : 3 = 7
x = 7-2 = 5

chúc bn hok tốt @_@

Answer 3

=> 45 -3 x ( x+2)=24

3 x ( x+2) =21

x+2 =7

=> x=5

Answer 4

45 - 3 x ( x + 2 ) = 2³ x 3

45-3x(x+2)=24

3 x (x+2)   =45-24

3 x (x+2)   =21

     x+2     =21:3

     x+2     =7

     x         =7-2

     x         =5

Answer 5

\(45-3\left(x+2\right)=2^3.3\)

\(3\left(x+2\right)=45-24\)

\(x+2=21:3\)

\(x+2=7\)

\(x=5\)

vậy \(x=5\)

Answer 6

45\(-\)3\(\times\)(x\(+\)2)\(=\)2³\(\times\)3

45\(-\)3\(\times\)(x\(+\)2)\(=\)24

            3\(\times\)(x\(+\)2)\(=\)45\(-\)24

            3\(\times\)(x\(+\)2)\(=\)21

                          x\(+\)2\(=\)21\(\div\)3

                          x\(+\)2\(=\)7

                          x            \(=\)7\(-\)2

                          x             \(=\)5

Answer 7

45 - 3 x (x+2) = 8 x 3 = 24

3 x (x+2) = 45 - 24 = 21

x+2 = 21 : 3 = 7

x = 7-2 = 5