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Black16
a fost răspuns

Daca x si y sunt direct proportionale cu 2 si 3 calculati :
A) 2x+3y/7x-4y
B) 7x-4y/x+2y

Răspuns :

CarMina03
x si y sunt direct proportionale cu 2 si 3 inseamna ca x/2=y/3=k deci x=2k si y=3k

2x+3y/7x-4y=2*2k+3*3k/7*2k-4*3k=4k+9k/14k-12k=13k/2k=13/2
7x-4y/x+2y=7*2k-4*3k/2k+2*3k=14k-12k/2k+6k=2k/8k=2/8=1/4

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