a) 41. 36+ 59. 90 + 41. 84 + 59. 30

= 41 . (36 + 84) + 59 . (90 + 30)

= 41 . 120 + 59 . 120

= 120 . ( 41 + 59 )

= 120 . 100

= 12000

b) 4. 51 . 7 + 2 . 86 .7 + 6 . 4 . 7

= 28 . 51 + 2 . 43 . 2 . 7 + 6 . 4 . 7

= 28 . 51 + 28 . 43 + 28 . 6

= 28 . ( 51 + 43 + 6 )

= 28 . 100

= 2800

c) ( 4.7 ) . 5 + ( 4.7 ) . 43 + ( 4.7) - 6

= 28 . 5 + 28 .43 + 28 - 6

= 28 . (5 + 43 + 1) - 6

= 28 . 49 - 6

= 1372 - 6

= 1366.

d) 53 . 39 + 47 . 39 - 53 . 21 - 47 . 21

= 53 . (39 - 21) + 47. (39 - 21)

= (39 - 21) . ( 53 + 47 )

= 18 . 100

= 1800.

\(43\cdot59+57\cdot59-43\cdot21-57\cdot21\)

\(=59\left(43+57\right)-21\left(43+57\right)\)

\(=3800\)

=59.(43+57)-21.(43+57)
=59.100-21.100
=100.(59-21)
=100.38
=3800

43 . 59 + 57 . 59 - 43 . 21 - 57 . 21

= 2537 + 3363 - 903 - 1197

= -826 - 294

= -1120

bằng 2 hoặc 15 nha bn

\(\left(3x-9\right)^{59}.\left(5x-75\right)^{86}=0\)

\(\Leftrightarrow\orbr{\begin{cases}\left(3x-9\right)^{59}=0\\\left(5x-75\right)^{86}=0\end{cases}}\)

\(\Leftrightarrow\orbr{\begin{cases}3x-9=0\\5x-75=0\end{cases}}\)

\(\Leftrightarrow\orbr{\begin{cases}3x=9\\5x=75\end{cases}}\)

\(\Leftrightarrow\orbr{\begin{cases}x=3\\x=25\end{cases}}\)

Vậy ...

a,= 5556  nha                                                                                     b,8607 nha

???????

41 x 36 + 59 x 90 + 41 x 84 + 59 x 30

= 41 x (36 + 84) + 59 x ( 90 + 30 )

= 41 x 120 + 59 x 120

= 120 x ( 41 + 59 )

= 120 x 100

= 12000

4 x 51 x 7 + 2 x 86 x 7 + 12 x 2 x 7

= 7 x ( 51 x 4 + 86 x 2 + 12 x 2 )

= 7 x ( 204 + 172 + 24 )

= 7 x 400

=2800

41x 36 +59 x 90 +41 x84 +59 x 30

  =41x (36+84) +59 x (90+30)

  =41 x 120 + 59x 120

  =120 x (41+59)

  =120x 100

  =12000

4x 51 x 7 + 2 x 86 x 7 + 12 x 2 x 7

  =7x (51 x 4 + 86 x 2 - 12 x 2 )

  =7x ( 204+ 172 + 24 )

  = 7x 400

 =2800

Ta có:

41 x 36 + 59 x 90 + 41 x 84 + 59 x 30

= 41 x (36+84) + 59 x (30+90)

=41 x 120+59 x 120

=(41+59) x 120=100 x 120=12000

4 x 51 x 7 + 2 x 86 x 7 + 12 x 2 x 7

=2 x 7 x (51 x 2+86+12)

=14 x 200

=2800

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