1) \(=\left(\frac{3}{5}+\frac{2}{5}\right).\frac{6}{11}\)

\(=1.\frac{6}{11}\)

\(=\frac{6}{11}\)

2)\(\frac{17}{25}.\left(\frac{11}{19}+\frac{6}{19}+\frac{2}{19}\right)\)

\(=\frac{17}{25}.1\)

\(=\frac{17}{25}\)

2.\(\frac{17}{25}.\frac{11}{19}+\frac{17}{25}.\frac{6}{19}+\frac{17}{25}.\frac{2}{19}=\frac{17}{25}\left(\frac{11}{19}+\frac{6}{19}+\frac{2}{19}\right)\\ =\frac{17}{25}.1\\ =\frac{17}{25}\)

a,=3/13.17/29.29/34

=3/13.1/2

=3/26

b,=(4/21+25/42).19/33

=11/14.19/33

=19/42

`a, = 3/13 xx (17/29 xx 29/34)`

`= 3/13 xx 1/2`

`= 3/26`.

`b, = 19/33(4/21 + 25/42)`

`= 19/33 xx ( 33/42 )`

`= 19/42`

`a)(3/13xx17/29)xx29/34=3/13xx17/29xx29/34=[3xx17xx29]/[13xx19xx17xx2]=3/26`

`b)4/21xx19/33+25/42xx19/33=19/33xx(4/21+25/42)=19/33xx(8/42+25/42)=19/33xx33/42=19/42`

313×1729)×2934(313×1729)×2934

=313×1729×2934=313×1729×2934

=3×17×2913×29×34=3×17×2913×29×34

=3×17×2913×29×2×17=3×17×2913×29×2×17

=313×2=313×2

=326=326

421×1933+2542×1933421×1933+2542×1933

=1933×(421+2542)=1933×(421+2542)

=1933×(842+25

1a) \(\frac{12}{17}+\frac{19}{17}+\frac{8}{17}\)

\(=\left(\frac{12}{17}+\frac{8}{17}\right)+\frac{19}{17}\)

\(=\frac{20}{17}+\frac{19}{17}\)

\(=\frac{39}{17}\)

b) \(\frac{2}{5}+\frac{7}{12}+\frac{13}{12}\)

\(=\frac{2}{5}+\frac{5}{3}\)

\(=\frac{31}{15}\)

2) \(\frac{25}{3}-x=\frac{5}{6}\)

                \(x=\frac{25}{3}-\frac{5}{6}\)

                \(x=\frac{45}{6}\)

ủng hộ tớ nha

dấu ''/'' là chia à bạn?

ai giúp mình với

a) 214 × 13 + 214 × 17 = 214 × (13 +17)

= 214 × 30

= 6420

b) 58 × 635 + 48 × 635 = (58 – 48 ) × 635

= 10 × 635

= 6350

c) 4 × 19 × 25 =100 × 19

= 1900

a: =17/25(13/19+6/19)=17/25

b: \(=\dfrac{47}{19}\cdot\dfrac{32}{15}-\dfrac{47}{19}\cdot\dfrac{17}{15}=\dfrac{47}{19}\)

`17/25xx(13/19+6/19)`

`17/25xx1`

`17/25`

`a)17/25xx13/19+17/25xx6/19`

`=17/25xx(13/19+6/19)`

`=17/25xx19/19=17/25`

`b)47/19:15/32-47/19:15/17`

`=47/19xx32/15-47/19xx17/15`

`=47/19xx(32/15-17/15)`

`=47/19xx15/15=47/19`

`4/6+7/13+17/9+19/13+1/9+14/6`

`=(4/6+14/6)+(7/13+19/13)+(17/9+1/9)`

`=18/6+26/13+18/9`

`=3+2+2`

`=7`

C1)  17/25.13/19+17/25.6/19                    C2)  17/25.13/19+17/25.6/19

       =17/25.(13/19+6/19)                                =221/475+102/475

       =17/25.1=17/25                                        =17/25

Học tốt nha

\(C1:\)

\(\frac{17}{25}x\frac{13}{19}+\frac{17}{25}x\frac{6}{19}\)

\(=\frac{17}{25}x\left(\frac{13}{19}+\frac{6}{19}\right)\)

\(=\frac{17}{25}x1\)

\(=\frac{17}{25}\)

\(C2:\)

\(\frac{17}{25}x\frac{13}{19}+\frac{17}{25}x\frac{6}{19}\)

\(=\frac{221}{475}+\frac{102}{475}\)

\(=\frac{323}{475}=\frac{17}{25}\)

17/25

$#Shả$

`A)=5/17xx(15/34+19/34)`

`=5/17xx1=5/17`

`B)=(13/12+7/12)+1/3`

`=5/3+1/3=2`