Question

(x - 12) - 15 = (20 - 7) - (18 + x)

vậy x = ?

nhanh giùm mik nha, cám ơn, ai nhanh nhất mik tích nhé !

Answer 1

(x - 12) - 15 = (20 - 7) - (18 + x)

x - 12 - 15 = 13- 18 - x

x - 27 = -5 - x

x +x = -5 +27

2x=22

x=11

Answer 2

nhưng mik cần " quy tắc chuyển về "

Answer 3

(x - 12) - 15 = (20 - 7) - (18 + x)

  x - 12 - 15 = 13 - 18 - x

         x - 27 = -5 - x

          x + x = -5 +27

              2x = 22

                x = 11

Answer 4

(x-12)-15=(20-7)-(18+x)

x-(12+15)=13-18-x

x-27       =(-5)-x

2x           =(-5)+27

2x           =22

  x           =22:2

  x            =11

Vậy x=11

#HOK TỐT#

Answer 5

\((x-12)-15=(20-7)-(18+x)\)

\(\Rightarrow x-12-15=20-7-18-x\)

\(\Rightarrow x-27=13-18-x\)

\(\Rightarrow x-27=-5-x\)

\(\Rightarrow x+x=27-5\)

\(\Rightarrow2x=22\)

\(\Rightarrow x=22\div2=11\)

Vậy x = 11

Answer 6

\((x-12)-15=(20-7)-(18+x)\)

\(x-12-15=20-7-18-x\)

\(x-27=13-18-x\)

\(x-27=-5-x\)

\(x+x=-5+27\)

\(2x=22\)

\(x=22:2\)

Vậy \(x=11\)

Answer 7

\(\left(x-12\right)-15=\left(20-7\right)-\left(18+x\right)\)

\(\Leftrightarrow x-12-15=20-7-18-x\)

\(\Leftrightarrow x-\left(12+15\right)=20-\left(7+18\right)-x\)

\(\Leftrightarrow x-27=20-25-x\)

\(\Leftrightarrow x-27=-5-x\)

\(\Leftrightarrow x+x=-5+27\)

\(\Leftrightarrow2x=22\)

\(\Leftrightarrow x=22\div2\)

\(\Leftrightarrow x=11\)

\(\text{Vậy }x=11\)