Đáp án:
Bài 1:
a) 3.5²-16:2²
=3.25-2²
=75-4
=71
b) 3^6:3²+2³.2²
=3^4+2^5
=81+32
=113
c) 2³.17-2³.14
=2³(17-14)
=8.3
=24
d) 17.85+15.17-120
=17(85+15)-120
=17.100-120
=1700-120
=1580
Bài 2:
a) 20-[30-(5-1)²]
=20-(30-16)
=20-14
=6
b) (39.42-37.42):42
=42(39-37):42
=2
c) 100-[75-(7-2)²]
=100-(75-25)
=100-50
=50
d) (2³.9^4+9³.45):(9².10-9²)
=(2³.3^8+3^6.3².5):[9²(10-1)]
=(2³.3^8+3^8.5):(9².9)
=[3^8(8+5)]:9³
=3^8.13:3^6
=3^2.13
=117
e) (20.2^4+12.4³-48.2²):8²
=(2².5.2^4+12.2^6-3.2^4.2²):8²
=(2^6.5+12.2^6-3.2^6):2^6
=2^6(5+12-3):2^6
=14
