\(a,79.2^3+21.2^3.\)
\(=\left(79+21\right)2^3.\)
\(=100.2^3=100.8=800.\)
\(b,2\left(6.4^2-85:5\right).\)
\(=2\left(6.16-17\right).\)
\(=2\left(96-17\right).\)
\(=2.81=162.\)
\(c,\left(-5\right).8.\left(-2\right).3.\)
\(=\left[\left(-5\right).\left(-2\right)\right].\left(8.3\right).\)
\(=10.24=240.\)
\(d,200+32-\left(50+32\right).\)
\(=200+32-50-32.\)
\(=\left(200-50\right)+\left(32-32\right).\)
\(=150+0=150.\)
\(e,3.\left(-2\right)^2+4.\left(-5\right)+20.\)
\(=3.4+4.\left(-5\right)+20.\)
\(=\left[3+\left(-5\right)\right]4+20.\)
\(=\left(-2\right).4+20.\)
\(=\left(-8\right)+20=12.\)
~ Học tốt ~