Question

x/y=0,8 si 12x -8y=160.sa se afle x si y

Answer 1

$\it \dfrac{x}{y}=0,8 \Rightarrow \dfrac{x}{y}=\dfrac{8}{10} \Rightarrow 8y=10x\ \ \ \ (*)\\ \\ \\ 12x-8y=160 \stackrel{(*)}\Longrightarrow} 12x-10x=160 \Rightarrow 2x=160 \Rightarrow x= 80\\ \\ \\ x=80 \stackrel{(*)}{\Longrightarrow} 8y=10\cdot80|_{:8} \Rightarrow y=10\cdot10 \Rightarrow y=100$

Answer 2

Răspuns

x\y=8\10=4\5 ;x=4k ;y=5k ; 12.4k-8.5k=160 ; 48k-40k=160 '; 8k=160 ;k=20 ;x=4.20=80 ;y=5.20=100

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