Các bn viết chi tiết ra giúp mk nha  Thanks 

a: 27/-180=-27/180=-3/20=-21/140

-6/-35=6/35=24/120

-3/-28=3/28=15/140

b: \(\dfrac{3\cdot4+3\cdot7}{6\cdot5+9}=\dfrac{3\left(4+7\right)}{30+9}=\dfrac{11}{13}=\dfrac{2849}{13\cdot259}\)

\(\dfrac{6\cdot9-2\cdot17}{63\cdot6-119}=\dfrac{54-34}{259}=\dfrac{20}{259}=\dfrac{260}{259\cdot13}\)

Tính máy tính nhé bạn

hình ảnh chỉ mang tính chất tham khảo

chữ đẹp đấy

\(\frac{3.4+3.7}{6.5+9}\)

\(=\frac{3.\left(4+7\right)}{30+9}\)

\(=\frac{11}{13}\)

\(\frac{6.9-2.17}{63.3-119}\)

\(=\frac{54-34}{189-119}\)

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

\(\frac{3.4+3.7}{6.5+9}=\frac{3\left(4+7\right)}{30+9}=\frac{3.11}{39}=\frac{33}{39}=\frac{11}{13}\)

\(\frac{6.9-2.17}{63.3-11}=\frac{54-54}{63.3-11}=0\)

\(\dfrac{3\cdot4+3\cdot7}{6\cdot5+9}=\dfrac{3\cdot11}{30+9}=\dfrac{33}{39}=\dfrac{11}{13}=\dfrac{77}{91}\)

\(\dfrac{6\cdot9-2\cdot17}{63\cdot3-119}=\dfrac{54-34}{189-119}=\dfrac{20}{70}=\dfrac{2}{7}=\dfrac{26}{91}\)

77 phần 91 và 26 phần 91

đáy chỉ là rút gọn thôi

\(\dfrac{3\cdot4+3\cdot7}{6\cdot5+9}=\dfrac{3\cdot11}{30+9}=\dfrac{33}{39}=\dfrac{11}{13}=\dfrac{77}{91}\)

\(\dfrac{6\cdot9-2\cdot17}{63\cdot3-119}=\dfrac{54-34}{189-119}=\dfrac{20}{70}=\dfrac{2}{7}=\dfrac{26}{91}\)