((25.9 - 25.17))(( - 8.80 - 8.10)) ) và  ((48.12 - 48.15))(( - 3.270 - 3.30)) ). hãy so sánh 2 phân số trên

lấy máy tính ra bấm là nó ra liền à

\(\frac{-35}{280}=\frac{\left(-35\right):35}{280:35}=\frac{-1}{8}\)     

\(\frac{24}{72}=\frac{24:24}{72:24}=\frac{1}{3}\)

\(\frac{15}{-105}=\frac{-15}{105}=\frac{\left(-15\right):15}{105:15}=\frac{-1}{7}\)

\(\frac{36}{240}=\frac{36:12}{240:12}=\frac{3}{20}\)

\(\frac{125}{1000}=\frac{125:125}{1000:125}=\frac{1}{8}\)

\(\frac{198}{126}=\frac{198:18}{126:18}=\frac{11}{7}\)

\(\frac{3}{243}=\frac{3:3}{243:3}=\frac{1}{81}\)

\(\frac{103}{3090}=\frac{103:103}{3090:103}=\frac{1}{30}\)

\(\frac{252525}{535353}=\frac{252525:10101}{535353:10101}=\frac{25}{53}\)

\(\frac{25.9-25.17}{-8.80-8.10}=\frac{25.\left(9-17\right)}{-8.\left(80+10\right)}=\frac{25.\left(-8\right)}{\left(-8\right).90}=\frac{5}{18}\)

a)2.3.5.13/26.35

=2.3.5.13/2.13.5.7

=3/7

b)18.6-18/-36.(-35)

=18.6-18/-(36.25)=18(6-1)/-(36.35)

=18.5/-(36.35)=2.3.3.5/-(2.2.3.3.5.7)

=-1/14

c)6.4+6.7/6.5+12=6.4+6.7/6.5+6.2

=6(4+7)/6(5+2)

=11/10

d)25.9-25.17/-8.80-8.10=25(9-17)/8(-80-10)

=25.(-8)/8(-90)

=5/18

e) 3⁴.5-3⁶/3⁴.13-3⁴

⁼3⁴(5-3²)/3⁴(13-1)

=5-3²/13-1=-1/3

\(\dfrac{25.9-25.17}{-8.80-8.10}=\dfrac{-200}{-720}=\dfrac{5}{18}\)

\(\dfrac{48.12-48.15}{-3.270-3.30}=\dfrac{-144}{-900}=\dfrac{4}{25}\)

a, Quy đồng

\(\dfrac{5}{18}=\dfrac{5\times25}{18\times25}=\dfrac{125}{450}\)

\(\dfrac{4}{25}=\dfrac{4.18}{25.18}=\dfrac{72}{450}\)

+)

\(\frac{1}{2}=\frac{6}{12};\frac{1}{3}=\frac{4}{12};-\frac{1}{12}\)

+)

\(\frac{9}{30}=\frac{3}{10}=\frac{12}{40};\frac{98}{80}=\frac{49}{40}\)

1/2=6/12   1/3=4/12  -1/12=-1/12

9/30=3/10    98/80=49/40

3/10=12/40  49/40=49/40

Ta có : 

\(\frac{1}{2}=\frac{1.6}{2.6}=\frac{6}{12}\)

\(\frac{1}{3}=\frac{1.4}{3.4}=\frac{4}{12}\)

\(-\frac{1}{12}\)

Vậy quy đồng mẫu số các phân số : \(\frac{1}{2};\frac{1}{3};-\frac{1}{12}\)ta được : \(\frac{6}{12};\frac{4}{12};-\frac{1}{12}\)

Ta có : 

\(\frac{9}{30}=\frac{9:3}{30:3}=\frac{3}{10};\frac{98}{80}=\frac{98:2}{80:2}=\frac{49}{40}\)

Lại có : \(\frac{3}{10}=\frac{3.4}{10.4}=\frac{12}{40}\)

Vậy quy đồng mẫu số các phân số \(\frac{9}{30};\frac{98}{80}\)ta được : \(\frac{12}{40};\frac{49}{40}\)

~ Ủng hộ nhé 

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

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

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

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

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

Các bn viết chi tiết ra giúp mk nha  Thanks