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`a)` `2(1)/(2)-x+4/5=2/3-(-4/7)`
`⇔5/2-x+4/5=2/3+4/7`
`⇔5/2+4/5-x=14/21+12/21`
`⇔25/10+8/10-x=26/21`
`⇔33/10-x=26/21`
`⇔x=33/10-26/21`
`⇔x=693/210-260/210`
`⇔x=433/210`
`b)` `1(4)/(5)=-0,15-x`
`⇔9/5=-3/20-x`
`⇔9/5+(-3/20)=x`
`⇔x=-3/20-9/5`
`⇔x=-39/20`
`c)` `-4/7-x=3/5-2x`
`⇔-x+2x=3/5+4/7`
`⇔x=41/35`
`d)` `(3/8-1/5)+(5/8-x)=1/5`
`⇔3/8-1/5+5/8-x=1/5`
`⇔3/8+5/8-1/5-x=1/5`
`⇔1-1/5-x=1/5`
`⇔4/5-x=1/5`
`⇔x=4/5-1/5=3/5`
Hãy giúp mọi người biết câu trả lời này thế nào?
`a)` `2(1)/(2)-x+4/5=2/3-(-4/7)`
`⇒5/2-x+4/5=2/3+4/7`
`⇒5/2+4/5-x=14/21+12/21`
`⇒25/10+8/10-x=26/21`
`⇒33/10-x=26/21`
`⇒x=33/10-26/21`
`⇒x=693/210-260/210`
`⇒x=433/210`
`b)` `1(4)/(5)=-0,15-x`
`⇒9/5=-3/20-x`
`⇒9/5+(-3/20)=x`
`⇒x=-3/20-9/5`
`⇒x=-39/20`
`c)` `-4/7-x=3/5-2x`
`⇒-x+2x=3/5+4/7`
`⇒x=41/35`
`d)` `(3/8-1/5)+(5/8-x)=1/5`
`⇒3/8-1/5+5/8-x=1/5`
`⇒3/8+5/8-1/5-x=1/5`
`⇒1-1/5-x=1/5`
`⇒4/5-x=1/5`
`⇒x=4/5-1/5=3/5`
Hãy giúp mọi người biết câu trả lời này thế nào?
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