Question

(5346-2808):54+51

187.(38+62)-87.(62+38)

25.{32:[12-4+4.(16:8)]}

A=50+51+52+.......+99+100

Answer 1

(5346-2808) : 54 + 51

=2538 : 54 + 51

= 47 + 51 = 98

187 . ( 38 + 62 ) - 87 . (62 + 38 )

=187 . 100 - 87 . 100

= 100 . ( 187 - 87 )

= 100 . 100

= 10000

25. { 32 : [12 -4 + 4 . ( 16 : 8 )]}

= 25. { 32 : [12 - 4 + 8]}

= 25 . { 32 : [8 + 8 ]}

= 25 . { 32 : 16 }

= 25 . 2 =50

A = 50 +51 + 52 + ......+ 99+100

A = ( 100 + 50 ) . 51 : 2

A = 150 .51 : 2

A = 7650 : 2

A = 3825

Chuc ban hoc tot

Answer 2

\(\left(5346-2808\right):54+51\)

\(=2538:54+51\)

\(=47+51=98\)

\(187\left(38+62\right)-87\left(62+38\right)\)

\(=187.100-87.100\)

\(=100\left(187-87\right)\)

\(=100.100=10000\)

\(25\left\{32:\left[12-4+4\left(16:8\right)\right]\right\}\)

\(=25\left\{32:\left[12-4+4.2\right]\right\}\)

\(=25\left\{32:\left[12-4+8\right]\right\}\)

\(=25\left\{32:16\right\}\)

\(=25.2=50\)

\(A=50+51+52+......+100\)

\(=\dfrac{\left[\left(100-50\right):1+1\right]\left(100+50\right)}{2}\)

\(=3825\)

Answer 3

(5346 - 2808) : 54 + 51

= 2538 : 54 + 51

= 47 + 51

= 98

187 . (38 + 62) - 87 . (62 + 38)

= 187 . 100 - 87 . 100

= (187 - 87) . 100

= 100 . 100

= 10000

25 . {32 : [12 - 4 + 4 . (16 : 8)] }

= 25 . (32 : 8 + 4 . 2)

= 25 . (4 + 8)

= 25 . 4 + 25 . 8

= 100 . 200

= 20000

A = 50 + 51 + 52 +.......+ 99 + 100

A có : (100 - 50) : 1 + 1= 51 (phần tử)

\(\Rightarrow\) A = (100 + 50) . 51 : 2 = 3825.