Question

Tìm x

1. 71- ( 33 + x ) = 26

2. 3636 : ( 12. x - 91 ) =36

3. ( x- 15 ) - 218 = 0

4. 45+ ( x- 6 ) . 3 =81

5. 124. x - 4. x - 70. x= 150

6. ( x+ 70 ) . a= aaaa ( 0 < a < 9, a E N )

Answer 1

\(71-\left(33+x\right)=26\)

<=> \(71-33-x=26\)

<=> \(38-x=26\)

<=> \(x=38-26=12\)

\(3636:\left(12x-91\right)=36\)

<=> \(12x-91=101\)

<=> \(12x=192\)

<=> \(x=16\)

\(\left(x-15\right)-218=0\)

<=> \(x-15=218\)

<=> \(x=233\)

\(45+\left(x-6\right).3=81\)

<=> \(\left(x-6\right).3=36\)

<=> \(x-6=12\)

<=> \(x=18\)

\(124x-4x-70x=150\)

<=> \(\left(124-4-70\right).x=150\)

<=> \(50x=150\)

<=> \(x=3\)

Answer 2

1) 71 - ( 33 + x ) = 26

<=>       33 + x   = 71 - 26

<=>       33 + x   = 45

<=>               x   = 12

2) 3636 : ( 12x - 91 ) = 36

<=>            12x - 91  = 101

<=>             12x        = 192

<=>                 x        = 16

3) ( x - 15 ) - 218 = 0

<=> x - 15            = 218

<=> x                   = 218 + 15

<=> x                   = 233

4) 45 + ( x - 6 ) .3 = 81

<=> 45 + ( x - 6 )  = 27

<=>           x - 6     = -18

<=>           x          = -12

5) 124x - 4x - 70x = 150

<=>  5x  = 150

<=>    x  = 150 : 50

<=>    x  = 3