Question

Daca a supra b= 2 supra 5,atunci 7a-2b supra 4a+3b=?
E URGENT!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Answer 1

a/b=2/3⇒2b=3a;
⇒b=3a/2;
⇒7a-2b/4a+3b
⇒7a-2·3a/2/4a+3·3a/2
⇒7a-3a/4a+9a/2
⇒4a/4a+9a/2
⇒4a/8a/2+9a/2
⇒4a/17a/2
⇒4a·2/17a
⇒4·2/17⇒8/17;

Answer 2

a = 2
b=5
⇒7 a - 2b = 7 * 2 - 2 * 5 = 14 - 10 = 4 supra
⇒ 4 a + 3 b = 4 * 2 + 3 * 5 = 8 + 15 = 23       ⇒4 supra 23