Question

A supra B este egal cu 2 supra 5 ,atunci 7a-2b supra 4a+3b este egal cu ...?

Answer 1

a/b=2/5=>a=2b/5
(7a-2b)/(4a+3b)=*se inlocuieste a*(14b/5-2b)/(8b/5+3b)=(4b/5)/(23b/5)=4b/23b=4/23

Answer 2

a/b=2/5
(7a-2b)/(4a+3b)=?
a/b=2/5=k
=> a=2k si b=5k
(7a-2b)/(4a+3b)=(14k-10k)/(8k+15k)=4k/23k=4/23