(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

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

\(=2538:54+51\)

\(=47+51=98\)

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

\(=187.100-87.100\)

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

\(=100.100=10000\)

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

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

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

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

\(=25.2=50\)

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

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

\(=3825\)

(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.

a) 113.38+87.62+113.62+87.38

 =(113.38+87.38)+(87.62+113.62)

 =38.(113+87)+62.(87+113)

 =38.200+62.200

 =200.(38+62)

 =200.100

 =20000

b) 2.125.18+3.12.252+4.223.9

= 2.18.125+3.12.252+4.9.223

=36.125+36.252+36.223

=36.(125+252+223)

=36.500

=18000

Chúc bạn học tốt~~~

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

= ( 62 + 38 ) x ( 187 - 87 )

= 100 x 100

= 10000

p/s : làm từng phần đợi mk chút ^^

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

= 25 x { 32 : [ 8 + 4 x 2 ] }

= 25 x { 32 : 16 }

= 25 x 2

= 50

\(187\times\left(38+62\right)-87\times\left(62+28\right).\)

\(=187\times100+87\times100\)

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

\(=100\times100\)

\(=10000\)

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

\(=25\left\{32:\left[12-4+4\times2\right]\right\}\)

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

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

\(=25\times2=50\)

\(12.62.3+6^2.38-125:25\\ =36.62+36.38-5\\ =36.\left(62+38\right)-5\\ =36.100-5\\ =3600-5\\ =3595.\)

\(12\cdot62\cdot3+6^2\cdot38-125:25\)

\(=12\cdot62\cdot3+36\cdot38-5\)

\(=2232+1368-5\)

\(=3595\)

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

=187:100-87.100

=1,87-8700

=-8701,87

Lời giải:
$A=64^2-54^2=(64-54)(64+54)=10.118=1180$

$B=76^2+2.76.23+23^2=(76+23)^2=99^2=(100-1)^2=100^2-2.100+1$

$=10000-200+1=9801$

$C=88^2+62^2-38^2-12^2=(88^2-38^2)+(62^2-12^2)$

$=(88-38)(88+38)+(62-12)(62+12)$

$=50.126+50.74=50(126+74)=50.200=10000$

a/=68

a) 125 : 25 + 12 . 4      c) 2680 + [ 10 . ( 4³ -54 ) : 5² + 2⁴]

= 5 + 48                        = 2680 + [ 10 . ( 64 - 54 ) : 25 + 16]

= 53                              = 2680 + [ 10 . 10 : 25 + 16]

                                     = 2680 + [ 100 : 25 + 16]

                                     = 2680 + [ 4 + 16 ]

                                     = 2680 + 20

                                     = 2700

a/ 125 : 25 + 12 . 4

=5+48

=53

c/ 2680 + [ 10 . ( 4³ - 54 ) : 5² + 2⁴ ]

=2680 +  [ 10 . 10 : 25 + 16 ]

= 2680 + 20

=2700

b/ 25 - ( 62 - 75 ) + ( - 38 )

= 25 - (- 13) + (- 38) 

=25 + 13 + (- 38)

=38 + (-38)

=0

62x62+62+38

=62x62+62x1+8

=62x(62+1)+8

=62x68+8

=3906+8

=3914

62*62+62+38=3944

 101 tk nhe

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