\(a,6^{12}:6^{10}-2^2.2-2022^0\\ =6^2-2^3-1\\ =36-8-1\\ =27\\ b,-37.86+37.76\\ =37.\left(-86\right)+37.76\\ =37.\left(-86+76\right)\\ =37.-10\\ =-370\\ c,-485-\left(357-485\right)+300\\ =-485-357+485+300\\ =\left(-485+485\right)+\left(-357+300\right)\\ =0+\left(-57\right)\\ =-57\)
a,612:610−22.2−20220
=62−23−1
=36−8−1
=27
b,−37.86+37.76
=37.(−86)+37.76
=37.(−86+76)
=37.−10
=−370
c,−485−(357−485)+300
=−485−357+485+300
=(−485+485)+(−357+300)
=0+(−57)
=−57