i) 5^9 : 5^7 + 70 : 14 - 2^0
= 5^2 + 70 : 14 - 1
= 25 + 5 -1
= 30 - 1
= 29
j) 295 - ( 31 - 2^2 .5 )^2
= 295 - ( 31 - 4 . 5 ) ^2
=295 - ( 31 - 20 )^2
= 295 - 11^2
= 295 -121
= 174
l) 36 : 3 . 2^2 + ( 2019 . 2020 )^0
= 36 : 3 . 2^2 + 2019^0 . 2020^0
= 36 : 3 . 4 + 1 . 1
= 12 . 4 + 1 . 1
= 48 + 1 . 1
= 49 .1
=49
MIK XIN CTLHN NHÉ
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