Câu 8:
\(A=53.39+47.39-53.21-47.21\\ =39.\left(53+47\right)-21.\left(53+47\right)\\ =39.100-21.100\\ =100.\left(39-21\right)\\ =100.18=1800\)
Câu 7:
\(152312:\left\{1930-\left[2.9+1969-\left(19.5+1890\right)\right]\right\}\\ =152312:\left\{1930-\left[18+1969-\left(95+1890\right)\right]\right\}\\ =152312:\left\{1930-\left[18+1969-\left(95+1890\right)\right]\right\}\\ =152312:\left\{1930-\left[1987-1985\right]\right\}\\ =152312:\left\{1930-2\right\}\\ =152312:1928=79\)
Câu 9:
\(936-\left[508-5.\left(5^{10}:5^8+2019^0\right)\right]\\ =936-\left[508-5.\left(5^2+1\right)\right]\\ =936-\left[508-5.\left(25+1\right)\right]\\ =936-\left[508-5.26\right]\\ =936-\left[508-156\right]\\ =936-352=584\)
Câu 6:
\(\left\{20-\left[\left(700+2.10^2\right):30\right]\right\}:5\\ =\left\{20-\left[\left(700+2.100\right):30\right]\right\}:5\\ =\left\{20-\left[\left(700+200\right):30\right]\right\}:5\\ =\left\{20-\left[900:30\right]\right\}:5\\ =\left\{20-30\right\}:5\\ =-10:5=-2\)
Câu 5:
\(A=3.\left\{5.\left[\left(5^2+2^3\right):11\right]-16\right\}+2021\\ =3.\left\{5.\left[\left(25+8\right):11\right]-16\right\}+2021\\ =3.\left\{5.\left[33:11\right]-16\right\}+2021\\ =3.\left\{5.3-16\right\}+2021\\ =3.\left\{15-16\right\}+2021\\ =3.\left(-1\right)+2021\\ =2021-3=2018\)
Câu 4:
\(A=\left(-16\right):\left(-8\right)+6.\left(2021-2022\right)^{2019}+2026\\ =2+6.\left(-1\right)^{2019}+2016\\ =2+6.\left(-1\right)+2016\\ =2-6+2016\\ =-4+2016=2012\)
