a) 11070 : {15 . [ 356 – ( 2110 – 2000 )]}

= 11070 : [15(356 – 110)] = 11070 : 3690 = 3

b) 62500 : { 50 2  : [ 112 – ( 52 –  2 3 . 5 )]}

= 62500 : { 2500 : [ 112 – ( 52 – 40 )]}

= 62500 : { 2500 : [ 112 – 12 ]}

= 62500 : { 2500 : 100 }

= 62500 : 25

= 2500

c)  3 3  .  5 3  – 20 . { 300 – [ 540 –  2 3  (  7 8  :  7 6  +  7 0  )]}

=  3 3  .  5 3  – 20 . {300 – [ 540 –  2 3 (72 + 1 )]

=  3 3  .  5 3  – 20 . [ 300 – (540 - 8 . 50)

= 27 . 125 – 20 . [300 – ( 540 - 400 )]

= 3375 – 20 . ( 300 – 140 )

= 3375 – 20 . 160

= 3375 – 3200

= 175

Bài làm

3³.5³-20.{546-2³.(7⁸:7⁶+7⁰)}

=27.125-20.{546-8.50}

=27.125-20.{546-400}

=3375-20.146

=3357-2920

=455

62500:{50²:[112-(52-2³.5)]}

=62 500:{250:[112-(52-40)]}

=62 500:{250:[112-12]

=62 500:{250:100}

=62 500:2,5

=25 000

a) \(3.5^2+15.2^2-26\div2\)

= 3.25 + 15.4 - 13

= 75 + 60 - 13

= 135 - 13

= 122

b) \(5^3.2-100\div4+2^3.5\)

= 125.2 - 25 + 8.5

= 250 - 25 + 40

= 225 + 40

= 265

c)\(6^2\div9+50.2-3^3.33\)

= 36 : 9 + 100 - 9.33

= 4 + 100 - 297

= 104 - 297

= -193

d)\(3^2.5+2^3.10-81\div3\)

= 9.5 + 8.10 - 27

= 45 + 80 - 27

= 125 - 27

= 98

e) \(5^{13}\div5^{10}-25.2^2\)

= 5³ - 25.4

= 125 - 100

= 25

f) \(20\div2^2+5^9\div5^8\)

= 20 : 4 + 5

= 5 + 5

= 10

a. 50-17+2-50+15

= (50-50)+(15+2-17)

= 0+0 = 0

a.0

b.79
c.16400
d.10

c) Ta co : A=1/2^1+1/2^2+...+1/2^49+1/2^50

2A=1+1/2+1/2^2+........+1/2^48+1/2^49

A=1-1/2^50<1

Vậy A=1/2^1+1/2^2+...+1/2^49+1/2^50 <1

\(=\dfrac{62500}{502:\left[112-52+115\right]}=\dfrac{62500}{502:175}\simeq21787,84861\)

\(62500:\left\{502:\left[112-\left(52-23.5\right)\right]\right\}\\ =62500:\left\{502:\left[112-\left(52-115\right)\right]\right\}\\ =62500:\left\{502:\left[112-\left(-63\right)\right]\right\}\\ =62500:\left\{502:175\right\}\\ =62500:\dfrac{502}{175}\\ =21787,84861\)

\(62500:\left\{502:\left[112-\left(52-23.5\right)\right]\right\}\)

\(=62500:\left\{502:\left[112-\left(52-115\right)\right]\right\}\)

\(=62500:\left\{502:\left[112-\left(-63\right)\right]\right\}\)

\(=62500:\left(502:175\right)\)

\(=62500:\dfrac{502}{175}\sim21788\)

A)13400

b)56

a) 48 . 19 + 48 .115 + 134 .52

= 48 . ( 19 + 115) + 134 . 52

= 48 . 134 + 134 . 52

= 134 . ( 48+52)

= 134 . 100

= 13400

b) 5^6 : 5^4 + 2^3 . 2^2 - 1^2017

= 5^2 + 2^5 - 1

= 25 + 32 - 1

= 56

câu b mình ko biết nên bạn thông cảm đen lại minh xe tăng bạn :

1 bộ váy:

                                                                                 hãy kb với mình nhé

a) \(48.19+48.115+134.52\)

\(=48.\left(19+115\right)+134.52\)

\(=48.134+134.52\)

\(=134.\left(48+52\right)\)

\(=134.100\)

\(=13400\)

b) \(5^6\div5^4+2^3.2^2-1^{2017}\)

\(=5^2+2^5-1\)

\(=25+32-1\)

\(=57-1\)

\(=56\)