(-72).(34 - 12) - 34 .(12 - 72)

= -72 . 34 + 72.12 - 34.12 + 34.72

= (-72.34 + 34.72) + (72 -34).12

= 0 + 38.12

= 456

(x-3).(\(x^2\)​+ 12) =0

(12 - x) x 9 = 72

12 - x = 72 : 9

12 - x = 8

x = 12 - 8

x = 4

Vậy x = 4

Linz

12-x=72:9

12-x=8

x=12-8

x=4

( 12 -x) *9 = 72 

12-x = 72 :9 

12-x = 8 

x= 12 -8 

x= 4

đúng

trả lời giúp mình

x⋮12 ⇒x∈B(12)

B(12)={0;12;24;36;48;60;72;...}

Vì 50<x\(\le\)72

nên x∈{60;72}

12. ( x - 3 ) : 3 = 72

12. ( x - 3 )      = 72 . 3 

12. ( x - 3 )      = 216

x - 3                = 216 : 12 

x - 3                = 18

x                     = 18 + 3

x                     = 21

\(-12\left(7-72\right)-25\left(55-43\right)\)

\(=-12\cdot\left(-65\right)-25\cdot12\)

\(=12\cdot65-25\cdot12\)

\(=12\left(65-25\right)\)

\(=12\cdot40=480\)

=−12⋅(−65)−25⋅12

\(\Rightarrow x-72-18=-12\\ \Rightarrow x-90=-12\\ \Rightarrow x=-78\)

x - 12 = 3x + 72

x - 3x = 72 + 12

    -2x = 84

       x = 84 : (-2)

       x = -42

\(x-12=3x+72\)

\(\Leftrightarrow x-3x=72+12\)

\(\Leftrightarrow-2x=84\)

\(\Leftrightarrow x=-42\)

x-12=3x+72

3x+x=72+12

x       =84:4=12

vậy x=12

ko bk đúng hay sai nha hi hi