Đáp án:
3^2021+1:4=3^2020.3+1:4=(3^4)^505+1:4=(.........3)+1:4=(.........4):4=(...........1)
2^100-1:3=(2^4)^25-1:3=(.........6)-1:3=(.........5):3=(...........5)
7^101-1:6=7^100.7-1:6=(7^4)^25.7-1:6=(........1).7-1:6=(........7)-1:6=(.......6):6=(...........1)