a) \(\dfrac{4}{5}\); \(\dfrac{3}{4}\); \(\dfrac{11}{13}\)

b) \(\dfrac{25}{35}\); \(\dfrac{100}{140}\); \(\dfrac{85}{119}\)

a) Những phân số tối giản là: \(\dfrac{4}{5};\dfrac{3}{4};\dfrac{11}{13}\)

b) Những phân số bằng \(\dfrac{5}{7}\) là: \(\dfrac{25}{35};\dfrac{100}{140};\dfrac{16}{28};\dfrac{85}{119}\)

a: 4/5; 3/4; 11/13

b: 25/35; 100/140; 16/28; 85/119

a) Các phân số tối giản là: \(\dfrac{4}{5};\dfrac{3}{4};\dfrac{11}{13}\)

b) Các phân số bằng phân số \(\dfrac{5}{7}\) là: \(\dfrac{25}{35};\dfrac{100}{140};\dfrac{85}{119}\)

a)4/5,3/4,11/13

b)25/35,100/140,85/119

a) \(\dfrac{16}{24};\dfrac{14}{15};\dfrac{25}{27};\dfrac{50}{100}\)
b) \(\dfrac{9}{4};\dfrac{5}{4};\dfrac{7}{5};\dfrac{19}{7};\dfrac{49}{36}\)
c) \(\dfrac{13}{13};\dfrac{35}{35}\)

a: 16/24; 14/15; 25/27; 50/100

b: 9/4; 5/4; 7/5; 19/7; 49/36

c: 13/13; 35/35

a  \(\dfrac{16}{24}\),  \(\dfrac{14}{15}\), \(\dfrac{15}{27}\)

b \(\dfrac{9}{4}\), \(\dfrac{5}{4}\), \(\dfrac{7}{5}\), \(\dfrac{19}{7}\), \(\dfrac{49}{36}\)

c \(\dfrac{13}{13}\)

\(\dfrac{7}{19}x\dfrac{8}{23}+\dfrac{7}{19}x\dfrac{15}{23}+1\dfrac{7}{19}\)

= \(\dfrac{7}{19}x\left(\dfrac{8}{23}+\dfrac{15}{23}\right)+1+\dfrac{7}{19}\)

=\(\dfrac{7}{19}x1+1+\dfrac{7}{19}\)

= \(\dfrac{7}{19}+1+\dfrac{7}{19}=1\dfrac{14}{19}\) = \(\dfrac{33}{19}\)

\(\dfrac{75}{100}+\dfrac{18}{21}+\dfrac{49}{32}+\dfrac{1}{4}+\dfrac{3}{21}-\dfrac{17}{32}\)

=  \(\dfrac{3}{4}+\dfrac{6}{7}+\dfrac{49}{32}+\dfrac{1}{4}+\dfrac{1}{7}-\dfrac{17}{32}\)

= \(\left(\dfrac{3}{4}+\dfrac{1}{4}\right)+\left(\dfrac{6}{7}+\dfrac{1}{7}\right)+\left(\dfrac{49}{32}-\dfrac{17}{32}\right)\)

= 1 + 1 + 1 = 3

\(\dfrac{8}{9}x\dfrac{15}{16}x\dfrac{24}{25}x\dfrac{35}{36}x\dfrac{48}{49}x\dfrac{63}{64}\)

= \(\dfrac{3}{4}\) *Câu này bạn tự sử dụng gạch nhé!

`1,`

`a,`

`7/19 \times 8/23 + 7/19 \times 15/23 + 1 7/19`

`= 7/19 \times 8/23 + 7/19 \times 15/23 + 1 + 7/19`

`= 7/19 \times (8/23 + 15/23 + 1) + 1`

`= 7/19 \times 2 + 1`

`=14/19 + 1`

`= 33/19`

`b,`

`75/100 + 18/21 + 49/32 + 1/4 + 3/21 - 17/32`

`= 75/100 + (18/21 + 3/21) + (49/32 - 17/32) + 1/4`

`= 0,75 + 1 + 1 + 0,25`

`= (0,75 + 0,25) + 1 + 1`

`= 1+1+1=3`

`c,`

`8/9 \times 15/16 \times 24/25 \times 35/36 \times 48/49 \times 63/64`

`=` \(\dfrac{2\times3}{3\times3}\times\dfrac{3\times5}{4\times4}\times\dfrac{3\times4\times2}{5\times5}\times\dfrac{5\times7}{6\times6}\times\dfrac{6\times8}{7\times7}\times\dfrac{7\times9}{8\times8}\)

`= 3/4` (bạn sử dụng gạch, rút gọn các số là được nhé).

a,25/100 +19/22+19/35+3/4+3/22+16/35

=(19/22+3/22)+(19/35+16/35)+(25/100+3/4)

=   22/22 + 35/35 + ( 1/4 + 3/4)

= 22/22 + 35/35 + 4/4

= 1 + 1 + 1

= 3

b, 2/5 : 4/7 - 2/5 : 2/3

=(2/5 - 2/5) : (4/7 : 2/3)

= 0 : 6/7

=0

tất cả các số kia là đều phần hết

1) \(\frac{25}{100}+\frac{19}{22}+\frac{19}{35}+\frac{3}{4}+\frac{3}{22}+\frac{16}{35}\)

\(=\frac{1}{4}+\frac{19}{22}+\frac{19}{35}+\frac{3}{4}+\frac{3}{22}+\frac{16}{35}\)

\(=\left(\frac{1}{4}+\frac{3}{4}\right)+\left(\frac{19}{22}+\frac{3}{22}\right)+\left(\frac{19}{35}+\frac{16}{35}\right)\)

\(=1+1+1\)

\(=3\)

2) \(\frac{2}{5}:\frac{4}{7}-\frac{2}{5}:\frac{2}{3}\)

\(=\frac{2}{5}:\left(\frac{4}{7}-\frac{2}{3}\right)\)

\(=\frac{2}{5}:\frac{-2}{21}\)

\(=-\frac{21}{5}\)

=))

\(\dfrac{105}{135}\)

105/135

105/135=7/9