help me plessss
\(\left(-713\right)-\left\{13-\left[207+\left(-46-61\right)\right]\right\}\)
\(=\left(-713\right)-\left\{13-\left[207+\left(-107\right)\right]\right\}\)
\(=\left(-713\right)-\left(13-100\right)\)
\(=\left(-713\right)-13+100\)
\(=-726+100\)
\(=-626\)
Đặt \(A=\left(-111\right)+\left(-110\right)+\left(-109\right)+...+0\)
\(B=1+2+...+110\)
\(A=\left(-111\right)+\left(-110\right)+\left(-109\right)+...+0\)
\(=\dfrac{\left(-111+0\right).\left(\left(111-0\right):1+1\right)}{2}\)
\(=\dfrac{-111.112}{2}=-6216\)
\(B=1+2+...+110\)
\(=\dfrac{\left(1+110\right).\left(\left(110-1\right):1+1\right)}{2}\)
\(=\dfrac{111.110}{2}=6105\)
\(A+B=-6216+6105=-111\)
