1) 45 – 3 (x-2) = 12 2) 120 : [ 3(x – 25 ) ] = 10

2 bình luận về “1) 45 – 3 (x-2) = 12 2) 120 : [ 3(x – 25 ) ] = 10”

1. 1.

   45-3(x-2)=12

            3(x-2)=45-12

            3(x-2)=33

               x-2 =33:3

               x-2 =11

               x =11+2=13

   2.

   120 : [ 3(x – 25 ) ] = 10

              3(x – 25 ) = 120 : 10

              3(x – 25 ) = 12

                   x – 25 = 12 : 3

                   x – 25 = 4

                   x = 25 + 4=29

    $#tqn$

   Trả lời
2. 1)

   45-3(x-2)=12

   -3(x-2)=12-45

   -3(x-2)=-33

   x-2=-33:(-3)

   x-2=11

   x=11+2

   x=13

   Vậy x=13

   2)

   120:[3(x-25)]=10

   3(x-25)=120:10

   3(x-25)=12

   x-25=12:3

   x-25=4

   x=4+25

   x=29

   Vậy x=29

   Trả lời