👤
a fost răspuns

a=(1+2+3...+50)-25x2. a=?

Răspuns :

0000000
[tex]A=(1+2+3...+50)-25*2 \\ \\ A= \frac{50(50+1)}{2} -25*2 \\ \\ A=25*51-25*2 \\ \\ A=25(51-2) \\ \\ A=25*49 \\ \\ A=1225[/tex]
Miha1107
1+2+3+...+50=50x51:2=25x51
25x51-25x2=25x(51-2)=25x49=1225