Question

bài 4

 

a)11/2:x+1/3=5/2-11/2

b 13/3.x-2/5=-8

c(5/2-3x).(3/2.x-2,25)=0

Answer 1

`11/2 : x + 1/3 = 5/2 - 11/2`

`11/2 : x + 1/3 = -6/2`

`11/2 : x + 1/3 = -3`

`11/2:x = -3 - 1/3`

`11/2 :x =-9/3 - 1/3`

`11/2 : x =-10/3`

`x=11/2 : (-10)/3`

`x=11/2 xx (-3)/10`

`x=-33/20`

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`13/3 .x - 2/5 = -8`

`13/3 . x = -8 + 2/5`

`13/3 . x = -40/5 + 2/5`

`13/3 . x = -38/5`

`x=-38/5 : 13/3`

`x=-38/5 xx 3/13`

`x=-65/114`

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`(5/2 -3x) . (3/2 x - 2.25)=0`

`(5/2 - 3x) . (3/2 x - 9/4)=0`

`@TH1:`

`5/2-3x=0`

`3x=5/2-0`

`3x=5/2`

`x=5/2:3`

`x=5/2 xx 1/3`

`x=5/6`

`@TH2:`

`3/2 x - 9/4 =0 `

`3/2 x = 0 + 9/4`

`3/2 x = 9/4`

`x=9/4 : 3/2`

`x=9/4 xx 2/3`

`x=3/2`

Answer 2

a: =>11/2:x=-10/3

=>x=-11/2:10/3=-33/20

b: =>13/3x=-8+2/5=-38/5

hay x=-65/114

c: =>5/2-3x=0 hoặc 3/2x-2,25=0

=>3x=5/2 hoặc 3/2x=2,25

=>x=5/6 hoặc x=3/2