\(\left(1+2+3+4+...+2015+2106\right)\times\left(9\times11-100+1\right)\)
\(=\left(1+2+3+4+...+2105+2106\right)\times\left(99-100+1\right)\)
\(=\left(1+2+3+4+...+2015+2106\right)\times\left[\left(99+1\right)-100\right]\)
\(=\left(1+2+3+4+...+2015+2106\right)\times\left(100-100\right)\)
\(=\left(1+2+3+4+...+2015+2106\right)\times0\)
\(=0\)
Chúc bạn học tốt nha!
Chúc bạn học tốt nha!
Chúc bạn học tốt nha!
ta có (9*11-100+1)=(9*11+1-100)=0
vậy (1+2+3+4+.......+2015+2016)*(9*11-100+1)=0
\(\left(1+2+3+4+5+..+2015+2106\right)\times\left(9\times11-100+1\right)\)
\(=\left(1+2+3+4+5+...+2015+2106\right)\times\left(99-100+1\right)\)
\(=\left(1+2+3+4+5+....+2015+2106\right)\times\left(100-100\right)\)
\(=\left(1+2+3+4+5+...+2015+2106\right)\times0\)
\(=0\)
