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Daca 3x=4y, determina x²-xy supra y²

Răspuns :

Renatemambouko
3x=4y       
x/y=4/3
(x²-xy)/y²=(x/y)²-x/y= (4/3)²-4/3=16/9-4/3=(16-12)/9=4/9
JolieJulie
3x=4y
=> x=4y/3
(x²-xy)y²=(16y²/9-4y²/3)/y²=(16y²-12y²)/9y²=4y²/9y²=4/9

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