Question

a) X - 1/2 =2/4                      b) 15 x X + 85 x X = 300

c)8,75 x X + 1,25 x X = 20

d) 52 x ( X : 76 ) = 3380

Đăng 2 bài nữa hong biết mn làm đc hok=((

Answer 1

a: =>x=1/2+1/2=1

b: =>100x=300

hay x=3

c: =>10x=20

hay x=2

d: =>x:76=65

hay x=4940

Answer 2

`a)x-1/2=2/4`

`=>x=2/4+1/2`

`=>x=1/2+1/2=2/2=1`

 

`b)15xx x+85xx x=300`

`(15+85)xx x=300`

`100xx x=300`

`x=300:100=3`

 

`c)8,75xx x+1,25xx x=20`

`(8,75+1,25)xx x=20`

`10xx x=20`

`x=20:10=2`

 

`d)52xx(x:76)=3380`

`x:76=3380:52=65`

`x=65xx76=4940`

Answer 3

a) x=2/4+2/4

x=1

b)(15+85) x X=300

100 x X=300

X=300:100=3

C) (8,75+1,25) x X=20

10 x X=20

X=20:10=2

d) X:76=65

X=65 . 76

X=4940

Answer 4

a) `X - 1/2 =2/4    `

`=> x = 2/4 + 1/2 =1/2 + 1/2 =2/2 =1`               

  b) `15 xx X + 85 xx X = 300`

`=> x xx(15+85) = 300`

`=> x = 300 / 100 = 3`

c)`8,75 xx X + 1,25 xx X = 20`

`=> x xx (8,75 + 1,25) =20`

`=> x xx 10 =20`

`=> x=20/10=2`

d)`52 xx ( X : 76 ) = 3380`

`=> x:76 = 3380 : 52 = 65`

`=> x =65xx76=4940`

Answer 5

\(a.X-\dfrac{1}{2}=\dfrac{2}{4}.\)

            \(X=\dfrac{2}{4}+\dfrac{1}{2}.\)

            \(X=\dfrac{4}{6}.\)

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\(b.15\times X+85\times X=300.\)

 \(\left(15+85\right)\times X=300.\)

 \(100\times X=300.\)

 \(X=\) \(300:100.\)

 \(X=3.\)

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\(c.8,75\times X+1,25\times X=20\)

  \(\left(8,75+1,25\right)\times X=20.\)

  \(10\times X=20.\)

          \(X=20:10.\)

          \(X=2.\)

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\(d.52\times\left(X:76\right)=3380\)

             \(X-76=3380:52.\)

             \(X-76=65.\)

             \(X=65+75.\)

             \(X=140.\)