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a fost răspuns

x=40% din y

a)\frac{x}{y}=?

b)\frac{3x+y}{x+y}=?

c)y reprezinta ?% din x

Răspuns :

Miky93ask
a)x= 40/100 *y= 10/25 *y= 2/5*y

x= 2y/5

x/y= 2y/5/y= 2y/5 * 1/y= 2/5

b)(3x+y)/(x+y)=  (3*2y/5 +y)/(2y/5 +y)=

=(6y/5 +y)/ (2y/5 +y)=

= (6y+5y)/5 / (2y+5y)/5=

= 11y/5 /7y/5=

= 11y/5 * 5/7y=  11/7

c)p% din x=y

p/100 * 2y/5=y

p/50 * y/5=y

p/50= y/y/5

p/50= y * 5/y

p/50=5

p=5*50=250%

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