Toán Lớp 7: Tìm x biết :
$\dfrac{31 – 2x}{x + 23}$ = $\dfrac{9}{4}$
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Toán Lớp 7: Tìm x biết :
$\dfrac{31 – 2x}{x + 23}$ = $\dfrac{9}{4}$
Comments ( 2 )
=>(31-2x).4=(x+23).9
=>31.4-2x.4=x.9+23.9
=>124-8x=9x+207
=>-8x-9x=207-124
=>x.(-8-9)=83
=>x.(-17)=83
=>x=83:(-17)
=>x=-83/17
Vậy x=-83/17