Question

Va rog!!
dau 30 de puncte cn o face​

Answer 1

Răspuns:

Explicație pas cu pas:

a) 3/4=9/12=(3+9)/(4+12)=12/16

3/4=9/12=(9-3)/(12-4)=6/8

3/4=9/12  ⇒  (4-3)/4=(12-9)/12=1//4=3/12

3/4=9/12    ⇒3/9=4/12=1/3

.........................................

1)3/9=1/3=(3+1)/(9+3)=4/12=1/3

2)3/9=1/3=(3-1)/(9-3)=2/6

3)3/9=1/3=(2·3+1)/(2·9+3)=7/21=1/3

4)3/(9-3)=1/(3-1)=1/2

5)(3+2·9)/(1+2·3)=21/7=3

6)(9-3·)/(3-1)=6/2

7)(3+3·1)/(9+3·3)=6/18

8) 3²/9²=1/3²

b)a/b=c/d=r

(a+c)/(b+d)=r

(a-c)/(b-d)=r

(c-a)/(d-b)=r

(2a+c)/(2b+d)=r

..........................

a/c=b/d=1/r

1)(a+b)/(c+d)=1/r

(a-b)/(c-d)=1/r

a²/b²=c²/d²=1/r²  pt arii la figuri asemenea

(2a+c)/(2b+d)=1/r

(a²+b²)/(c²+d²)=1/r²

(a²-b²)/(c²-d²)=1/r²

(3a-2c)/(3b-2d)=1/r

a³/b³=c³/d³=1/r³ pt volume la corpuri asemenea