a) 2017 x 34 + 2017 x 65 + 2017

= 2017 x ( 34+65+1)

= 2017 x 100

= 201700

b) 3/5 x 7/9 - 3/5 x 2/9

= 3/5 x ( 7/9- 2/9)

= 3/5 x 5/9

= 1/3

a) 2017 x 34 + 2017 x 65 + 2017

= 2017 x (34 + 65 + 1)

= 2017 x 100

= 201700

b) \(\dfrac{3}{5}\) x \(\dfrac{7}{9}\) - \(\dfrac{3}{5}\) x \(\dfrac{2}{9}\)

= \(\dfrac{3}{5}\) x \(\left(\dfrac{7}{9}-\dfrac{2}{9}\right)\)

= \(\dfrac{3}{5}\) x \(\dfrac{5}{9}\)

= \(\dfrac{1}{3}\)

\(a,=2017\times\left(34+65+1\right)=2017\times100=201700\)

\(b,\dfrac{3}{5}\times\left(\dfrac{7}{9}-\dfrac{2}{9}\right)=\dfrac{3}{5}\times\dfrac{5}{9}=\dfrac{15}{45}=\dfrac{1}{3}\)

35 . 34 + 35 . 38 + 65 . 75 + 65 . 45 + 35 . 34 = 

= 35 . 34 + 35 . 38 + 35 . 34 + 65 . 75 + 65 . 45 

= 35 . ( 34 + 38 + 34 ) + 65 . ( 75 + 45 )

=  35 . 110  + 65 . 110 

= 110 . ( 35 + 65 ) 

= 110 . 100

= 11000

Hok tốt!!!!!!!!!!!!!

a) Tính bằng cách hợp lí nhất :

35 . 34 + 35 . 38 + 65 . 75 + 65 . 45 + 35 . 34

= 35 . 34 + 35 . 38 + 35 . 34 + 65 . 75 + 65 . 45

= 35 . ( 34 + 38 + 34 ) + 65 . ( 75 + 45 )

= 35 . 106 + 65 . 120

= 3710 + 7800

= 11510

3 . 25 . 8 + 4 . 37 . 6 + 2 . 38 . 12

= 3 . 8 . 25 + 4 . 6 . 37 + 2 . 12 . 38

= 24 . 25 + 24 . 37 + 24 . 38

= 24 . ( 25 + 37 + 38 )

= 24 . 100

= 2400

b) Tìm số tự nhiên x, biết :

( x - 5 ) ( x + 7 ) = 0

\(\Rightarrow\orbr{\begin{cases}x-5=0\\x+7=0\end{cases}\Rightarrow\orbr{\begin{cases}x=5\\x=-7\end{cases}}}.\)

Vậy .......

3 . 25 . 8 + 4 . 37 . 6 + 2 . 38 . 12 = 

= 3 . 8 . 25 +  4 . 6 . 37 + 2 . 12 . 38

= 24 . 25 + 24 . 37 + 24 . 38

= 24 . ( 25 + 37 + 38 )

= 24 . 100 

= 2400

Hok tốt!!!!!!!!!!!

a,456*65+456*34+456

=456*65+456*34+456*1

=456*(65+34+1)

=456*100

=45600

a) = 456 x ( 65 + 34 + 1 )

     = 456 x 100

     = 45600

a ) 456 x 65 + 456 x 34 + 456

= 456 x 65 + 456 x 34 + 456 + 1

= 456 x ( 65 + 34 + 1 )

= 456 x      100

= 45600

b ) hong bít

Mik làm theo suy nghĩ nên k đúng hay sai cx đc nhen :))

`34, 65 + 21,78 + 65,35 + 78, 22 `

`= (34, 65 +65,35 ) + ( 21,78 +78, 22 ) `

`=             100         +           100`

`=                              200`

`b. 4,5 xx 5,5 + 4,7 xx 4,5    `

`= 4,5 xx ( 5,5 + 4,7 ) `

`= 4,5 xx 10,2` 

`= 45,9`   

`c. 7,5 xx 2,5 xx 4 `

`= 7,5 xx ( 2,5 xx 4 ) `

`= 7,5 xx 10`

`=75`   

`34,65+21,78+65,35+78,22`

`=(34,65+65,35)+(21,78+78,22)`

`=100+100=200`

`b)4,5xx5,5+4,7xx4,5`

`=4,5xx(5,5+4,7)`

`=4,5xx10,2`

`=4,5xx(10+0,2)`

`=4,5xx10+4,5xx0,2`

`=45+0,9=45,9`

`c)7,25xx2,5xx4`

`=7,25xx(2,5xx4)`

`=7,25xx10=72,5`

a)=35x(34+38)+72x(65+65)

=35x72+72x130

=72x(35+130)

=72x165

=11880

a) 19 x 64 + 76 x 34 = 19 x 64 + 19 x 4 x 34 = 19 x (64 + 4 x 34) = 19 x 200 = 3800

b) 35 x 12 + 65 x 13 = 35 x 12 + 65 x 12 + 65 = 12 x (35 + 65) + 65 = 12 x 100 + 65 = 1265

c) 136 x 68 + 16 x 272 = 136 x 68 + 16 x 2 x 136 = 136 x (68 + 16 x 2) = 136 x 100 = 13600

cái này làm sao tính nhah đc

a) 19 x 64 + 76 x 34 = 19 x 64 + 19 x 4 x 34 = 19 x (64 + 4 x 34) = 19 x 200 = 3800

b) 35 x 12 + 65 x 13 = 35 x 12 + 65 x 12 + 65 = 12 x (35 + 65) + 65 = 12 x 100 + 65 = 1265

c) 136 x 68 + 16 x 272 = 136 x 68 + 16 x 2 x 136 = 136 x (68 + 16 x 2) = 136 x 100 = 13600

4a) \(\frac{x}{36}=\frac{3}{4}\)

\(\Rightarrow\frac{x}{36}=\frac{27}{36}\)

\(\Rightarrow x=27\)

4b) 33 + x = 71 - 26

33 + x = 45

x = 45 - 33

x = 12

4c) x * (3,5 + 1,5) = 10

x * 5 = 10

x = 10 ; 5 = 2

4,

\(a,\frac{x}{36}=\frac{24}{32}\)

\(=>\frac{x}{36}=\frac{3}{4}=\frac{27}{36}\)

\(=>x=27\)

\(b,71-\left(33+x\right)=26\)

\(=>-\left(33+x\right)=26-71=-45\)

\(=>33+x=45\)

\(=>x=12\)

\(c,3,5\cdot x+1,5\cdot x=10\)

\(>x\cdot\left(3,5+1,5\right)=10\)

\(=>x\cdot5=10\)

\(=>x=2\)

. là nhân nha

4. 

a) x/36 = 24/32

24/32 = 3/4 = 27/36

=> x = 27

b) 71 - ( 33 + x ) = 26

33 + x = 71 - 26

33 + x = 45

x = 45 - 33

x = 12

c) 3, 5 . X + 1, 5 . x = 10

x( 3, 5 + 1, 5 ) = 10

x . 5 = 10

x = 10 : 5

x = 2

5.

a) 4, 63 . 7, 8 + 7, 8 + 7, 8 . 4, 32

= 7, 8. ( 4, 63 + 4, 32 + 1 )

= 7, 8 . 9, 95

= 77, 61

b) 35 . 34 + 35 . 86 + 65 . 75 + 65 . 45

= 35( 34 + 86 ) + 65( 75 . 45 )

= 35 . 120 + 65 . 120

= 120 . ( 35 + 65 )

= 120 . 100

= 12 000

a.35 x 34 + 35 x 38 + 65 x 75 + 45 x 65

= 35 x (34 + 38) + 65 x 75 + 65 x 45

= 35 x     72      + 65 x (75+45)

= 35 x 72 + 65 x 120

= 35 x 72 + 65 x (72 + 48)

= 35 x 72 + 65 x 72 + 65 x 48

= (35+65) x 72 + 65  x 48

=   100 x 72 + 65 x 48

=      7200   +    3120

=           10320

b.39 x 8 + 60 x 2 + 21 x 8

=39 x 8 + 15 x 4 x 2 +21 x 8

= 39 x 8 + 15 x 8 + 21 x 8

=(39 + 15 + 21) x 8

=      75            x 8

=             600

c.58 x 75 + 58 x 50 - 58 + 25

= 58 x 75 + 58 x 50 - 58 x 1 + 25

= 58 x(75+50-1)+25

= 58 x   124     + 25

=    7192          + 25

=              7217

d.125 x 98 - 125 x 46 - 52 x 25

= 25 x 5 x 98 - 25 x 5 x 46 - 25 x 52

= 25 x 490 - 25 x 230 - 25 x 52

= 25 x (490 - 230 - 52)

= 25 x      208

=       5200

ham mo chi qua

a) 3800

b) 1265

c) 13600

a) 19 . 64 + 76 .34 = 38. 32 + 38 . 68
                                  = 38 . (32 + 68) = 38 .100 = 3800
b) 35 . 12 + 65 . 13 = 35 . 12 + 65 . (12 + 1)
                                   = 35 . 12 + 65 . 12 + 65 = 12 . (35 + 65) + 65
                                   = 1200 + 65 = 1265.
c) 136 . 68 + 16 . 272 = 136 . 68 + 32 .136
                                       = 136 . (66 + 32) = 136 . 100 = 13600

k mik nha!

\(a,19\times64+76\times34.\)

\(=38\times32+38\times68\)

\(=38\times\left(68+32\right)\)

\(=38\times100\)

\(=3800\)

\(b,35\times12+65\times13\)

\(=35\times12+65\times\left(12+1\right)\)

\(=35\times12+65\times12+65\)

\(=12\times\left(35+65\right)+65\)

\(=12\times100+65\)

\(=1265\)

\(c,136\times68+16\times272\)

\(=136\times68+32\times136\)

\(=136\times\left(32+68\right)\)

\(=136\times100\)

\(=13600\)