b)
=64.35+140.84-1
=2240 + 11760 - 1
=13999
c)
=80+202 : (5.12-3.16+28)
=80+400 : (60 - 48+28)
=480:40
=12
Em tham khảo cách làm:
a)
\(45-12.3+2^3\\ =45-12.3+8\\ =45-36+8\\ =17\)
b)
\(4^3.35+2.70.84-2020^0\\ =64.35+2.70.84-1\\ =2240+140.84-1\\ =2240+11760-1\\ =14000-1\\ =13999\)
c)
\(80+20^2:\left[5.12-3.\left(6-2\right)^2+28\right]\\ =80+20^2:\left[5.12-3.4^2+28\right]\\ =80+20^2:\left[5.12-3.16+28\right]\\ =80+20^2:\left[60-48+28\right]\\ =80+20^2:40\\ =80+400:40\\ =80+10\\ =90\)
