Question

Exercitile 7,5,2 raspunsuri la toate problemele va rog

Answer 1

7. daca a+b+c=8 atunci rezultatul e 888 pt ca se aduna unitatile cu unitattile, zecile cu zecile si sutele cu sutele

5. x+3y=10
3x+9y+11=3(x+3y)+11=3*10+11=30+11=41

2. b+2c=9
7a+4b+8c=64
7a+4(b+2c)=7a+4*9=7a+36
7a+36=64
7a=64-36
7a=28
a=4
4ab+8ac=4a(b+2c)=4*4*9=16*9=144

a+b=12
b+c=7
7a+10b+3c=7a+7b+3b+3c=7(a+b)+3(b+c)=7*12+3*7=84+21=105
7a+4b-3c=7a+7a-3b-3c=7(a+b)-3(b+c)=7*12-3*7=84-21=63