Răspunsuri

2014-08-19T12:58:37+03:00
X*2 -X+2X-2=X*2+5X-2X-10 2X*2-2X=-8 2(X*2-X)=8 X*2-X=4
1 5 1
2014-08-19T19:42:30+03:00
Daca a/b=c/d atunci a*d=b*c
Aplic regula si obtin
(x+5)(x-2)=(x+2)(x-1)
x^2-2x+5x-10=x^2-x+2x-2
3x-10=x-2
3x-x=10-2
2x=8
x=8:2
x=4