Question

Daca 3a+12b =51 aflati a+4b




Daca x=5 si Xa+2Xb=60 aflati a+2b





Daca 6a-9b-5=19 aflati 2a-3b





Daca 3a-4b-3=11 afkati 6a-8b





Aflati toate numerele care impartite la 9 , dau restul egal cu dublul catului



_____ ____ ____
Aflati numarul abcd daca abcd -dabc =2871 si d=5

Answer 1

1.
3a+12b =51
 a+4b

3×(a+4b)= 51
a+4b=51 ÷3
a+4b=17

2.
x=5 si
xa+2xb=60
a+2b

x( a+2b)=5×(a+2b)= 60
a+2b=60÷5
a+2b=12

3.
6a-9b-5=19 aflati
2a-3b


6a-9b=19+5
6a-9b=24
3×(2a-3b)=24
2a-3b=24÷3
2a-3b=8


4.
3a-4b-3=11
6a-8b= ?

3a-4b=11+3
3a-4b=14
6a- 8b= 2×(3a-4b)= 2×14= 28

5.
x÷9= 1 r.2; x= 9+2=11
x÷ 9=2 r.4 ; x= 9×2+4=22
x÷9=3 r.6; x=9×3+6=33
x÷9= 4 r.8 ; x= 9×4+8=44

7.
abcd ;  abcd - dabc = 2871 si d=5

c= 5-1=4
b=7+7=14
a= 17-1-8= 8

8 7 4 5 - 
5 8 7 4   
----------- 
2 8 7 1