a 1/3 + 5/6 = 7/6

b 2/5 + 3/5 = 1

c 7/8 + 5/8 = 3/2

d 2/7 + 1/6 = 19/42

deo hieu cau tra loi cua kan kan

bay gio thi hieu roi

Câu 1: \(\frac{17}{51}\)x \(\frac{45}{30}\)= \(\frac{1}{3}\)x \(\frac{3}{2}\)

                                   = \(\frac{1}{2}\).

Câu 2: \(\frac{24}{15}\)x \(\frac{56}{72}\)x \(\frac{10}{14}\)= \(\frac{8}{5}\)x \(\frac{7}{9}\)x \(\frac{5}{7}\)

                                                 = \(\frac{56}{45}\)x \(\frac{5}{7}\)

                                                 = \(\frac{8}{9}\)

Câu 3: \(\frac{32}{48}\times\frac{35}{21}\times\frac{63}{14}\times\frac{9}{30}=\frac{2}{3}\times\frac{5}{3}\times\frac{9}{2}\times\frac{3}{10}=\frac{3}{2}\)

k nha

a)17/51x45/40=1/3x3/2=3/6=1/2

b)24/15x56/72x10/14=8/5x7/9x5/7=8/9

c)32/48x35/21x63/14x9/30=2/3x5/3x9/2x3/10=3/2

x x 134 -x x24 -x x 10 = x x ( 134 - 24 - 10)

x = x x 100

x = 1300 : 100

x = 13

A)2/7:4/5=2/7*5/4=10/28=5/14

b)3/8:9/4=3/8*4/9=12/72=1/6

c)8/21:4/7=8/21*7/4=56/84=2/3

D)5/8:15/8=5/8*8/15=40/120=1/3

k nha

a 1/4 va 1/2 

1/4<1/2

2/3>2/5

5/6=45/54(5/6)

cậu này đễ mà bạn

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\(\frac{15}{25}=\frac{15:5}{25:5}=\frac{3}{5}\); \(\frac{6}{21}=\frac{6:3}{21:3}=\frac{2}{7}\)

\(\frac{3}{5}+\frac{2}{7}=\frac{31}{35}\)

\(\frac{15}{25}+\frac{6}{21}=\frac{3}{5}+\frac{2}{7}=\frac{21}{35}+\frac{10}{35}=\frac{31}{35}\)

15/25+6/21

ta có:

15/25=15:5/25:5=3/5

6/21=6:3/21:3=2/7

3/5+2/7=31/35

tick nha

18/7

TAI SAO LAI 18 / 7

18/7

84/98 bạn nhé

hiêụ giữa phân số mới và phân cũ là

6/7-36/49=6/49

mẫu số là

12x49/6=98

tử số là

98/7x6=84

phân số đó là 84/98

Đ/s 84/98