Question

Answer 1

\(a,\left(-125\right)+\left(-45\right)\\ =-\left(125+45\right)\\ -170\)           

\(b,2^2.5-6^2:4+1^{2019}\\ =4.5-36:4+1\\ =20-9+1\\ =11+1\\ =12\)

\(c,287+121+513+79\\ =\left(287+513\right)+\left(121+79\right)\\ =800+200\\ =1000\)

\(d,120-\left[7.20-\left(134-110.5\right)\right]\\ =120-\left[140-\left(134-550\right)\right]\\ =120-\left[140-\left(-416\right)\right]\\ =120-556\\ =-436\)