bài 2 tìm x a,x+1\4=4\3 b,-x-2\3=-6\7 c,4\5-x=1\3 giúp mình với m.n mai mình thi rồi
2 câu trả lời
Đáp án:
$a)\ x+\dfrac{1}{4}=\dfrac{4}{3}\\\Leftrightarrow x=\dfrac{4}{3}-\dfrac{1}{4}\\\Leftrightarrow x=\dfrac{4.4}{12}-\dfrac{1.3}{12}\\\Leftrightarrow x=\dfrac{13}{12}$
Vậy `x=13/12`
$b)\ -x-\dfrac{2}{3}=-\dfrac{6}{7}\\\Leftrightarrow -x=-\dfrac{6}{7}+\dfrac{2}{3}\\\Leftrightarrow -x=-\dfrac{3.6}{21}+\dfrac{7.2}{21}\\\Leftrightarrow -x=-\dfrac{4}{21}\\\Leftrightarrow x=\dfrac{4}{21}$
Vậy `x=4/21`
$c)\ $` 4/5-x=1/3`
`<=>-x=1/3-4/5`
`<=>-x=1.5/15-3.4/15`
`<=>-x=-7/15`
`<=>x=7/15`
Vậy `x=7/15`
`a)x+1/4=4/3`
`<=>x=4/3-1/4`
`<=>x=13/12`
Vậy `x=13/12`
`b)-x-2/3=-6/7`
`<=> -x=-6/7+2/3`
`<=> -x=-4/21`
`<=>x=-4/21 :(-1)`
`<=>x=4/21`
Vậy `x=4/21`
`c)4/5-x=1/3`
`<=>x=4/5-1/3`
`<=>x=7/15`
Vậy `x=7/15`
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