Question

tim so tu nhien x , biet

a, 5x - x = 29 - 36 : 4

b, ( 3x - 48 ) . 6 = 3 mu 3 . 2 mu 2 + 2 mu 3 . 3 mu 2 - 12 mu 2

c, x thuoc B(6) va 22 < x < hoac = 36

Answer 1

a) \(\Leftrightarrow4x=20\Leftrightarrow x=5\)

Answer 2

b) \(\Leftrightarrow18x-288=27.4+8.9-144\)

\(\Leftrightarrow18x=108+72-144+288=324\)

\(\Leftrightarrow x=18\)

Answer 3

c)Ta có:

\(x\in B\left(6\right)\) và \(22< x\le36\)

mà \(B\left(6\right)=\left\{0;6;12;18;24;30;36;42;48;...\right\}\)

\(\Rightarrow x\in\left\{0;6;12;18;24;30;36;42;48;...\right\}\) và \(22< x\le36\)

\(\Rightarrow x\in\left\{24;30;36\right\}\)

Vậy \(x\in\left\{24;30;36\right\}\)

Answer 4

a)5x-x=29-36:4

5x-x=29-9

5x-x=20

=>5x-x=5x-1x=20

=>5x-1x=20

4x=20

x=20:4

x=5

Vậy x=5