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2014-11-05T22:32:13+02:00
Fie x,y,z numerele.
x+y+z=220
2x=y-2=z+7 = a => x=  \frac{a}{2} ; y=a+2 si z=a-7.
x+y+z=220 <=>  \frac{a}{2} + a+2+ a-7 =220 =>  \frac{a}{2} +2a =225 <=>  \frac{a}{2} +  \frac{4a}{2} =225 <=>  \frac{5a}{2} =225 => a= \frac{225*2}{5}  = 90
x= \frac{a}{2} =45
y=a+2=92
z=a-7=83

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