a) 2724 - (22 . 32 - 24 . 3)
= 2724 - (4 . 9 - 16 . 3)
= 2724 - (36 - 48)
= 2724 - (- 12)
= 2712
b) 47 - (45 . 24 - 52 . 12) : 14
= 47 - (45 . 16 - 25 . 12) : 14
= 47 - (720 - 300) : 14
= 47 - 420 : 14
= 47 - 30
= 17
a)
\(2724 - (\)22.32-24.3)
\(= 2724 - (4 . 9 - 16 . 3)\)
\(= 2724 - (36 - 48) \)
\(= 2724 - (- 12) \)
\(= 2712 \)
b)
\(47 - (\)45 . 24-52.12) : 14
\(= 47 - (45 . 16 - 25 . 12) : 14 \)
\(= 47 - (720 - 300) : 14 \)
\(= 47 - 420 : 14 \)
\(= 47 - 30 \)
\(=17\)
c)
\(100 + 97+94+...+4+1\)
\(=(100+1).[(100-1):(4-1)+1]:2\)
\(=101.[99:3+1]:2\)
\(=101.[33+1]:2\)
\(=101.34:2\)
\(=1717\)
\(#Nguyễn Ngọc Khánh Linh\)
