Question

a) 91 - x = 90

b) x - 73 . 21 = 73 . 26

c) 6 . ( x +11 ) = 0

d) 2x - 12 - x = 9

Answer 1

a) 91 - x = 90

          x = 91 - 90

          x = 1

b) x - 73.21 = 73.26

    x = 73.26 + 73.21

    x = 73.(26 + 21)

    x = 73.47

    x = 3431

c) 6.(x + 11) = 0

    x + 11 = 0 : 6

    x + 11 = 0

   x = 0 - 11

   x = -11

d) 2x - 12 - x = 9

   => 2x - (12 + 9) = x

   => (2 - 1)x = 21

   => x = 21

Answer 2

a)x=1

b)x=3431

c)x=-11

d)x=21

Answer 3

91-x =90

x =91 -90

x =1

Answer 4

a , x = 1

b,  x = 3431

c , x = -11

d , x = 21

Answer 5

a) 91 - x = 90

x=91-90

x=1

b) x - 73 . 21 = 73 . 26

x-1533=1898

x=3431

c) 6 . ( x +11 ) = 0

x+11=0

x=-11

d) 2x - 12 - x = 9

x-12=9

x=21

Answer 6

a) 91-x=90

         x=91-90

         x=1

b) x-73.21=73.26

    x-73.21=1898

              x=1898+(73.21)

              x=3431

c)6.(x+11)=0

              x=.......(rỗng)

d)2x-12-x=9

             x=21

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