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daca x/y=2/5 atunci 2x+5x/3x+8y

Răspuns :

Vezi calculele atasate  .................
Vezi imaginea ALITTA
X/Y = 2/5 ==> X = 2Y/5

2X+5X/3X+8Y =

= (4Y/5+10Y/5)/(6Y/5+8Y) =

= 14Y/5 / (6Y+8Y×5)/5 =

= 14Y/5 / (6Y+40Y/5) =

= 14Y/5 × 5/46Y =

= 14Y/46Y =

= 7/23