Question

Tìm x thuộc N biết

X-36:18=12

(X:23+45).67=8911

(X-5)(x-7)=0

Answer 1

x - 36 : 18 = 12

x - 2 = 12

x = 12 + 2

x = 14

(x : 23 + 45) . 67 = 8911

x : 23 + 45 = 8911 : 67

x : 23 + 45 = 133

x : 23 = 133 - 45

x : 23 = 88

x = 88 . 23

x = 2024

Answer 2

(x - 5)(x - 7) = 0

=> \(\orbr{\begin{cases}x-5=0\\x-7=0\end{cases}}\)

=> \(\orbr{\begin{cases}x=5\\x=7\end{cases}}\)

Answer 3

x - 36 : 18 = 12

=> x - 36 = 216

=> x = 252

( x : 23 + 45 ) . 67 = 8911

=>  x : 23 + 45  = 133

=> x : 23 = 88

=> x = 2024

( x - 5 )( x - 7 ) = 0

=> [x - 5 = 0 => x = 5

=> [ x - 7 = 0 => x = 7