x + 12 - 45 = 78
x + 12 = 78 + 45
x + 12 = 123
x = 123 - 12
x = 111
Vậy x = 111
x+12-45=78
x+12 =78+45
x+12 = 123
x =123-12
x 111
\(x+12-45=78\)\(\Rightarrow x-33=78\)\(\Rightarrow x=78+33\Rightarrow x=111\)
x + 12 - 45 = 78
x + 12 = 78 + 45
x +12 = 123
x =123 - 12
x = 111
\(x+12-45=78\)
\(x+12=78+45\)
\(x+12=123\)
\(x=123-12\)
\(x=111\)
x + 12 - 45 = 78
x + 12 = 78 + 45
x + 12. = 123
x = 123 - 12
x = 111
x + 12 - 45 = 78
x + 12 = 78 + 45
x + 12 =123
x = 123 - 12
x = 111
nhớ nha bn
\(x+12-45=78\)
\(x+12=78+45\)
\(x+12=123\)
\(x=123-12\)
\(x=111\)
ai k mk mk k lai
x+12-45=78
x+12=78+45
x+12=123
x=123-12
x=111