câu 10 tìm x : A)-1/2 – x = 1/3 – 1/4
B)-2/3 + x = -3/4
C)9/4 – x = 2/3 – -7/-8
câu 10 tìm x : A)-1/2 – x = 1/3 – 1/4 B)-2/3 + x = -3/4 C)9/4 – x = 2/3 – -7/-8
By Samantha
By Samantha
câu 10 tìm x : A)-1/2 – x = 1/3 – 1/4
B)-2/3 + x = -3/4
C)9/4 – x = 2/3 – -7/-8
`a)-1/2 – x = 1/3 – 1/4`
`=> -1/2 – x = 1/12`
`=> x = -1/2 – 1/12`
`=> x= -7/12`
`b) -2/3 + x = -3/4`
`=> x = -3/4 – (-2)/3`
` => x= -1/12`
`c) 9/4 – x = 2/3 – (-7)/-8`
`=> 9/4 – x = 2/3 – 7/8`
`=> 9/4 – x = -5/24`
`=> x = 9/4 – (-5)/24`
`=> x = 59/24`
Đáp án + Giải thích các bước giải :
`a.`
`-1/2-x=1/3-1/4`
`→-1/2 – x = 1/12`
`→ x = 1/2 – 1/12`
`→ x= – 7/12`
Vậy `x=-7/12`
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`b.`
`-2/3 + x = -3/4`
`→x=-3/4–2/3`
`→x=-1/12`
Vậy `x=-1/12`
—————————–
`c.`
`9/4 – x = 2/3 – -7/-8`
`→9/4-x=2/3-7/8`
`→9/4-x=-5/24`
`→x=9/4–5/24`
`→x=59/24`
Vậy `x=59/24`
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