Question

subpunctele b și c
Va rog repede​

Answer 1

Răspuns:

⁵⁾2/4+⁴⁾3/5=a/10+b/10

10/20+12/20=(a+b)/10

22/20=(a+b)/10

22·10=20(a+b)

a+b=220:22=>a+b=11

(a,b)=(1,10);(10,1);(2,9);(9,2);(3,8);(8,3);(4,7);(7,4);(5,6);(6,5)

_________________

⁷⁾1/9+⁹⁾1/7=³⁾a/21+b/63

7/9+9/7=3a/63+b/63

16/63=(3a+b)/63

63(3a+b)=63·16

3a+b=16

a=1=>3a+b=16=>3+b=16=>b=16-3=>b=13

a=2,b=10

a=3,b=7

a=4,b=4

a=5,b=1

(a,b)=(1,13);(2,10);(3,7);(4,4);(5,1)

________________

⁵⁾1/12+⁴⁾1/15=⁶⁾a/10+³⁾b/20

5/60+4/60=6a/60+3b/60

9/60=(6a+3b)/60

9=3(2a+b)=>2a+b=3

a=1,b=1

2·1+1=2+1=3

a,b)=(1,1)