a, bằng nhau

b , >

c, >

=  ,  >   ,  >

Chúc em hk tốt!!

#Ly#

\(a.1\frac{1}{3}+2\frac{1}{2}\)

\(=\frac{4}{3}+\frac{5}{2}\)

\(=\frac{8}{6}+\frac{15}{6}\)

\(=\frac{23}{6}\)

\(b.3\frac{2}{5}-1\frac{1}{7}\)

\(=\frac{17}{5}-\frac{8}{7}\)

\(=\frac{119}{35}-\frac{40}{35}\)

\(=\frac{79}{35}\)

\(c.3\frac{1}{2}.1\frac{1}{7}\)

\(=\frac{7}{2}.\frac{8}{7}\)

\(=4\)

\(d.4\frac{1}{6}:2\frac{1}{3}\)

\(=\frac{25}{6}:\frac{7}{3}\)

\(=\frac{25}{6}.\frac{3}{7}\)

\(=\frac{25}{14}\)

b) \(\frac{5}{9}\)và \(\frac{5}{8}\) :Quy đồng mẫu số : \(\frac{5}{9}\) = \(\frac{5.8}{9.8}\) = \(\frac{40}{72}\) ; \(\frac{5}{8}\) = \(\frac{5.9}{8.9}\) = \(\frac{45}{72}\)

Vì \(\frac{40}{72}\) < \(\frac{45}{72}\) nên \(\frac{5}{9}\) < \(\frac{5}{8}\)

c)\(\frac{8}{7}\) và \(\frac{7}{8}\) :Quy đồng mẫu số: \(\frac{8}{7}\) = \(\frac{8.8}{7.8}\) = \(\frac{64}{56}\) ; \(\frac{7}{8}\) = \(\frac{7.7}{8.7}\) =\(\frac{49}{56}\)

Vì \(\frac{64}{56}\) > \(\frac{49}{56}\) nên \(\frac{8}{7}\) > \(\frac{7}{8}\)

bạn an đông à cái câu A của bạn sai một chút.

CHÚC BẠN HỌC TỐT !

a)\(\frac{3}{7}\) và\(\frac{2}{8}\) :Quy đồng mẫu số : \(\frac{3}{7}\) = \(\frac{3.8}{7.8}\) = \(\frac{24}{56}\) ; \(\frac{2}{8}\) = \(\frac{2.7}{8.7}\) = \(\frac{14}{56}\)

Vì \(\frac{24}{56}\) > \(\frac{14}{56}\) nên \(\frac{3}{7}\) > \(\frac{2}{8}\)

a, Sai

b, Đúng

c, đúng 

d, Sai

a,\(2\frac{2}{5}+1\frac{2}{5}=3\frac{2}{5}\left(S\right)\)

b,\(6\frac{3}{4}-1\frac{1}{4}=5\frac{2}{4}\left(\text{Đ}\right)\)

c,\(3\frac{1}{2}\times2\frac{2}{3}=9\frac{1}{3}\left(\text{Đ}\right)\)

d,\(4\frac{1}{6}\div2\frac{1}{5}=2\frac{5}{6}\left(S\right)\)

a,=25/6;7/6=25/6x6/7=25/7

b,=7/2x32/6=56/3

c,=17/5-11/10=34/10-11/10=23/10

d,=8/3+11/4=32/12+33/12=65/12

a,=25/6;7/6=25/6x6/7=25/7

b,=7/2x32/6=56/3

c,=17/5-11/10=34/10-11/10=23/10

d,=8/3+11/4=32/12+33/12=65/12

\(\frac{8}{9}+\frac{1}{3}=\frac{8}{9}+\frac{3}{9}=\frac{11}{9}\)

\(\frac{8}{9}+\frac{1}{3}=\frac{8}{9}+\frac{3}{9}=\frac{11}{9}\)

\(\frac{24}{15}-\frac{20}{25}=\frac{24}{15}-\frac{4}{5}=\frac{24}{15}-\frac{12}{15}=\frac{12}{15}\)

\(3\frac{1}{6}\times2\frac{3}{5}=\frac{19}{6}\times\frac{13}{5}=\frac{247}{30}\)

\(2\frac{1}{10}\div2\frac{2}{5}=\frac{21}{10}\div\frac{12}{5}=\frac{21}{10}\times\frac{5}{12}=\frac{7}{8}\)

a) \(\frac{1}{2}\times x-3=6\)

=> \(\frac{1}{2}\times x=6+3\)

=> \(\frac{1}{2}\times x=9\)

=>\(x=9:\frac{1}{2}\)

=> \(x=18\)

b) \(2:x=\frac{2}{5}--\frac{1}{10}\)

=> \(2:x=\frac{2}{5}+\frac{1}{10}\)

=> \(2:x=\frac{1}{2}\)

=> \(x=2:\frac{1}{2}\)

=> \(x=4\)

c) \(25-\left(2\frac{1}{2}+x\right)=10\)

=> \(2\frac{1}{2}+x=25-10\)

=> \(\frac{5}{2}+x=15\)

=>\(x=15-\frac{5}{2}\)

=> \(x=\frac{25}{2}\)

d) \(\left(x-\frac{3}{4}\right)\times3-45:9=10\)

=> \(\left(x-\frac{3}{4}\right)\times3-5=10\)

=> \(\left(x-\frac{3}{4}\right)\times3=10+5\)

=> \(\left(x-\frac{3}{4}\right)\times3=15\)

=> \(\left(x-\frac{3}{4}\right)=15:3\)

=> \(\left(x-\frac{3}{4}\right)=5\)

=> \(x=5+\frac{3}{4}\)

=> \(x=\frac{23}{4}\)

\(a,\frac{1}{2}.x-3=6\Rightarrow\frac{x}{2}=9\Rightarrow x=18\)

\(b,2:x=\frac{2}{5}-\frac{1}{10}\Rightarrow\frac{2}{x}=\frac{9}{10}\Rightarrow x=\frac{2.10}{9}=\frac{20}{9}\)

\(c,25-\left(2\frac{1}{2}+x\right)=10\Rightarrow25-\frac{5}{2}+x=10\Rightarrow x=10+\frac{5}{2}-25=-\frac{25}{2}\)

\(d,\left(x-\frac{3}{4}\right).3-45:9=10\Rightarrow\left(x-\frac{3}{4}\right).3-5=10\Rightarrow\left(x-\frac{3}{4}\right).3=15\Rightarrow x-\frac{3}{4}=5\Rightarrow x=\frac{23}{4}\)

haizzz bn cứ làm như thường là đc ròi, cần j phải hỏi

Tại cô giáo chưa dậy đến đã giao bài về nhà nên mình mới không biết làm !!!

biết làm nhưng tui lười ko muốn viết dài

a, 2\(\dfrac{3}{5}\) \(\times\) 1\(\dfrac{1}{4}\) + \(\dfrac{5}{2}\)

= \(\dfrac{13}{5}\) \(\times\) \(\dfrac{5}{4}\) + \(\dfrac{5}{2}\)

= \(\dfrac{13}{4}\) + \(\dfrac{5}{2}\)

= \(\dfrac{13}{4}\) + \(\dfrac{10}{4}\)

= \(\dfrac{23}{4}\)