23+47+11+49

=(23+47)+(11+49)

=    70    +   60

=          130

4.7.11.25

=(4.25).(7.11)

=  100 .  77

=     7700

5.9.3.2

=(5.2).(3.9)

=   10.  27

=     270

23+47+11+49 = 70 + 60 = 130

4.7.11.25 = 4 . 25 . 7 . 11 = 100 x 77 = 7700

5.9.3.2 = 5 x 2 x 3 x 2 = 10 x 6 = 60 

\(23+47+11+49\)

\(=\left(23+47\right)+\left(11+49\right)\)

\(=70+60\)

\(=130\)

\(4x7x11x25\)

\(=\left(4x25\right)x\left(7x11\right)\)

\(=100x77\)

\(=7700\)

\(5x9x3x2\)

\(=\left(5x2\right)x\left(9x3\right)\)

\(=10x27\)

\(=270\)

K mình nha mình nhanh nhất đó!

Giải thích hơi dài, tớ chỉ ghi đ/s thôi.

Đ/s: 1.

20/11*33/23*69/180=20*33*69/11*23*180=9/9=1

= (( 7,5 + 26,4 ) x 18,3 ) x ( 4,7 x 11 - 47 x 10 - 47 ) 

= ( 33,9 x 18,3 ) x ( 4,7 x ( 11 - 10 - 1) 

= 620,37 x 0 

= 0

( 7,5 x 18,3 + 26,4 x 18,3 ) x ( 47 x 11 -4700 x 0,1 - 47)

= (( 7,5 + 26,4 ) x 18,3 ) x ( 47 x 11 - 47 x 10 - 47)

= ( 33,9 x 18,3) x (( 11 - 10 - 1 ) x 47 )

= 620,37 x ( 0 x 47)

= 620,37 x 0

= 0

Chúc bạn học tốt !

a)\(\frac{20}{11}.\frac{33}{23}.\frac{69}{180}=\frac{9}{9}=1\)

b: (675,98 + 888,66 + 111,34) x 0,01

= (675,98 + [888,66 + 111,34]) x 0,01

= (675,98 + 1000) x 0,01

= 1675,98 x 0,01

= 16,7598 

(675,98 + 888,66 + 111,34) x 0,01

= (675,98 + [888,66 + 111,34]) x 0,01

= (675,98 + 1000) x 0,01

= 1675,98 x 0,01

= 16,7598 

19/11 + [ 8/13 + 3,11 ]

= [ 19/11 + 3/11 ] + 8/13

=   22/11 + 8/13

= 2 + 8/13

= 34/13

19/11 + ( 8/13 + 3/11 ) = 19/11 + 8/13 + 3/11 = ( 19/11 + 3/11 ) + 8/13 = 2 + 8/13 = 26/13 + 8/13 = 34/13

k mk nha mk k lai

\(2\frac{8}{13}\)

20,11x96+20,11:0,25

=20,11x96+20,11x4

=20,11x100

=201,1

20, 11×96+20, 11:0, 25

= 20,11 x 96 + 20,11 x 4

= 20,11 x ( 96 + 4 )

= 20,11 x 100

= 2011

   20,11 x 96 + 20,11 : 0,25

= 20,11 x 96 + 20,11 x 4

= 20,11 x (96+4)

= 20,11 x 100

= 2011

19/11 + [8/13 + 3/11]

=19/11+ 3/11+ 8/13

= 2 + 8/13

= 34/13

=\(\frac{19}{11}+\frac{3}{11}+\frac{8}{13}\)

=\(2+\frac{8}{13}\)

=\(2\frac{8}{13}\)

19/11+(8/13+3/11)=(19/11+3/11)+8/13=2+8/13=26/13+8/13=34/13