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Bocskortunde80
a fost răspuns

5(x+3)+2*[2+3(x+2)]=31 b, x+2x+3x+...+29x=1+2+3+....+600

Răspuns :

7UP
A) 5x+15+2*(2+3x+6)=31
5x+15+4+6x+12=31
11x+31=31
11x=31-31
11x=0
x=0/11  / -> supra
x=0

X(1+2+3+.........+29)=1+2+3+4+............+600
1+2+3+...........+29=29 x 30:2=870:2=435
1+2+........+600=600 x 601:2=360 600:2=180 300
X x 435=180 300
X=414,4


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