Tìm x , biết a) 7+(-x) =(-5)-(-14) b)-18-x = -8 + (-13) c)-x + (-32) +(-46) = -84 d) x – 43 = (57-x ) – 50 Giup mình vs

Question

Tìm x , biết a) 7+(-x) =(-5)-(-14) b)-18-x = -8 + (-13) c)-x + (-32) +(-46) = -84 d) x - 43  = (57-x ) - 50 Giup mình vs

giahan · Answer

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tonhi · Answer

a)

` 7+(-x) =(-5)-(-14)`

`7-x =(-5)+14`

`7-x=9`

`-x=9-7`

`-x=2`

`x=-2`

vậy` x=-2`

b)

`-18-x = -8 + (-13) `

`-18-x = -8 -13`

`-18-x =-21`

`-x=-21+18`

`-x=-3`

`x=3`

vậy `x=3`

c)

`-x + (-32) +(-46) = -84`

`-x -32-46 =-84`

`-x=-84+32+46`

`-x=-6`

`x=6`

vậy `x=6`

d)

`x – 43 = (57-x ) – 50`

`x-43=57-x-50`

`2x=57-50-43`

`2x=-46`

`x=-46:2`

`x=-23`

vậy `x=-23`

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