Ta có 

   13 = 13

   60 = 2² . 3 . 5

   40 = 2³. 5

BCNN ( 13, 60, 40 ) = 2³. 3 .5 . 13 = 1560

MC : 1560

Thừa số phụ 

        1560 : 13 =120

        1560 : 60 = 26

         1560 : 40 = 39

Ta co

7/13 = 7.120/13.120=840/1560

13/60 = 13 . 26/ 60.26 = 338/1560

-9/40 = - 9 . 39/ 40 . 39 = -351/ 1560

Ta có  -64 / 90 = -32/45

 60 = 2² . 3. 5

18 = 2 . 3²

45 = 3². 5

BCNN ( 60, 18, 45 ) = 2² . 3² . 5 = 180

MC : 180

Thừa số phụ 

    180 : 60 = 3

    180 : 18 = 10

    180 : 45 = 4

Ta có

    17/60 = 17 . 3/ 60. 3 = 51/180

    -5/18 = -5 . 10/18.10 = -50/180

    -64/90 = -32/45 = -32 . 4 / 45 . 4 = -128/180

Mong các bạn nha

\(x\) là nhân bạn nhé.

a. Chọn mẫu số chung là 120, ta có:

\(\frac{7}{30}=\frac{7x4}{30x4}=\frac{28}{120}\)

\(\frac{13}{60}=\frac{13x2}{60x2}=\frac{26}{120}\)

\(\frac{9}{40}=\frac{9x3}{40x3}=\frac{27}{120}\)

Vậy quy đồng mẫu số 3 phân số\(\frac{7}{30};\frac{13}{60};\frac{9}{40}\)ta được 3 phân số mới là: \(\frac{28}{120};\frac{26}{120};\frac{27}{120}.\)

b. Chọn mẫu số chung là 180, ta có:

\(\frac{17}{60}=\frac{17x3}{60x3}=\frac{51}{180}\)

\(\frac{5}{18}=\frac{5x10}{18x10}=\frac{50}{180}\)

\(\frac{64}{90}=\frac{64x2}{90x2}=\frac{128}{180}\)

Vậy quy đồng mẫu số 3 phân số \(\frac{17}{60};\frac{5}{18};\frac{64}{90}\)ta được 3 phân số mới là \(\frac{51}{180};\frac{50}{180};\frac{128}{180}.\)

a) \(-\dfrac{5}{14}=-\dfrac{5.3}{14.3}=-\dfrac{15}{42}\)

\(\dfrac{1}{-21}=-\dfrac{1}{21}=-\dfrac{1.2}{21.2}=-\dfrac{2}{42}\)

b) \(\dfrac{17}{60}=\dfrac{17.3}{60.3}=\dfrac{51}{180}\)

\(\dfrac{-5}{18}=\dfrac{-5.10}{18.10}=-\dfrac{50}{180}\)

\(-\dfrac{64}{90}=-\dfrac{64.2}{90.2}=-\dfrac{128}{180}\)

a)-5/14 và 1/-21

-5/14=-5.-21/14.-2=105/-28

-64/90=-32/45=-32*4/45*4=-128/180

a: 3/7=18/42

5/6=35/42

b: 5/17=15/51

9/51=9/51

c: 3/8=9/24

5/6=20/24

g: 7/30=28/120

13/60=26/120

9/40=27/120

a, \(\frac{11}{120}=\frac{11.40}{120.40}=\frac{440}{4800}\)

\(\frac{7}{40}=\frac{7.120}{40.120}=\frac{840}{4800}\)

b,\(\frac{24}{146}=\frac{24.13}{146.13}=\frac{312}{1898}\)

\(\frac{6}{13}=\frac{6.146}{13.146}=\frac{876}{1898}\)

c,\(\frac{7}{30}=\frac{7.60.40}{30.60.40}=\frac{16800}{72000}\)

\(\frac{13}{60}=\frac{13.30.40}{60.30.40}=\frac{15600}{72000}\)

\(\frac{-9}{40}=\frac{-9.60.30}{40.60.30}=\frac{-16200}{72000}\)

d,\(\frac{17}{60}=\frac{17.18.90}{60.18.90}=\frac{27540}{97200}\)

\(\frac{-5}{18}=\frac{-5.60.90}{18.60.90}=\frac{-27000}{97200}\)

\(\frac{-64}{90}=\frac{-64.18.60}{90.18.60}=\frac{-69120}{97200}\)

740 =7.12040.120 =8404800 

b,24146 =24.13146.13 =3121898 

1360 =13.30.4060.30.40 =1560072000 

−940 =−9.60.3040.60.30 =−1620072000 

d,1760 =17.18.9060.18.90 =2754097200 

−518 =−5.60.9018.60.90 =−2700097200 

−6490 =−64.18.6090.18.60 =−6912097200 

6

a: 3/8=36/96

5/12=40/96

b: -2/9=-24/108

-5/12=-45/108

c: -3/16=-63/336

-5/24=-70/336

-21/56=-126/336

\(\dfrac{17}{60};\dfrac{-5}{18};\dfrac{-64}{90}\) MSC : 180

\(\dfrac{17}{60}=\dfrac{17\cdot3}{60\cdot3}=\dfrac{51}{180}\)

\(\dfrac{-5}{18}=\dfrac{\left(-5\cdot10\right)}{18\cdot10}=\dfrac{-50}{180}\)

\(\dfrac{-64}{90}=\dfrac{\left(-64\cdot2\right)}{90\cdot2}=\dfrac{-128}{180}\)

17 x 3/ 60 x 3 = 51/180

-5 x10/18 x 10 = -50/180

-64 x2/90 x2 = -128/180

\(\dfrac{17}{60}=\dfrac{17.3}{60.3}=\dfrac{51}{180}\)

\(-\dfrac{5}{18}=\dfrac{-5.10}{18.10}=-\dfrac{50}{180}\)

\(-\dfrac{64}{90}=\dfrac{-64.2}{90.2}=-\dfrac{128}{180}\)