9/4 - 8/9 = 32/36 - 81/36 = -49

d=49/36

\(\frac{4}{6}\)+ y =\(\frac{7}{5}\)

y = \(\frac{7}{5}\)- \(\frac{2}{3}\)

y = \(\frac{21}{15}\)-\(\frac{10}{15}\)

y = \(\frac{11}{15}\)

k cho mk nha

4/6+y=7/5

y=7/5-4/6

y=22/30=11/15

chúc bạn hok tốt

2/11 < 3/14 < 3/11

\(\frac{102}{53}+\frac{45}{67}+\frac{22}{67}+\frac{4}{53}=\left(\frac{102}{53}+\frac{4}{53}\right)+\left(\frac{45}{67}+\frac{22}{67}\right)\)

\(=\frac{106}{53}+\frac{67}{67}=2+1=3\)

\(\frac{102}{53}+\frac{45}{67}+\frac{22}{67}+\frac{4}{53}\)

\(=\left(\frac{102}{53}+\frac{4}{53}\right)+\left(\frac{45}{67}+\frac{22}{67}\right)\)

\(=\frac{106}{53}+\frac{67}{67}\)

\(=2+1\)

\(=3\)

\(\frac{8}{15}< \frac{11}{20}< \frac{9}{15}\)

:>>>>

12 / 15 . Đúng không ?

Ta có:\(\frac{10}{13}<\frac{12}{x}<\frac{10}{12}\)

=>\(\frac{120}{156}<\frac{120}{10x}<\frac{120}{144}\)

=>156>10x>144

=>\(\frac{156}{10}>x>\frac{144}{10}\)

=>15 lớn hơn hoặc bằng x lớn hơn hoặc bằng 14

=>x\(\in\){15,14}

\(\frac{125}{61}-\frac{22}{39}+\frac{100}{39}-\frac{3}{61}=\left(\frac{125}{61}-\frac{3}{61}\right)+\left(\frac{100}{39}-\frac{22}{39}\right)\)

\(=\frac{122}{61}+\frac{78}{39}=2+2=4\)

\(\frac{82}{59}+\frac{95}{91}+\frac{36}{59}+\frac{87}{91}=\left(\frac{82}{59}+\frac{36}{59}\right)+\left(\frac{95}{91}+\frac{87}{91}\right)\)

\(=\frac{118}{59}+\frac{182}{91}=2+2=4\)

\(\frac{82}{59}+\frac{95}{91}+\frac{36}{59}+\frac{87}{91}\) \(=\left(\frac{82}{59}+\frac{36}{59}\right)+\left(\frac{95}{91}+\frac{87}{91}\right)=\frac{118}{59}+\frac{182}{92}=2+2=4\)

Đầu bài kiểu j vậy ???????????????

\(\frac{137}{91}-\frac{46}{71}+\frac{117}{71}-\frac{46}{91}\)

\(=\left(\frac{137}{91}-\frac{46}{91}\right)-\left(\frac{46}{71}-\frac{117}{71}\right)\)

\(=\frac{91}{91}-\frac{-71}{71}\)

\(=1-\left(-1\right)=2\)