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a)1/2=3/12 vì 1.12=4.3(=12)
b)2/3<6/8 vì 2.8 < 3.6(16< 18)
c)Ta có : 4/3=12/9
12/9>-12/9Suy ra 4/3 >-12/9
d)-3/5=9/-15 vì -3.-15=5.9(=45)
a) \(\frac{1}{4}\)và\(\frac{3}{12}\)
\(\frac{3}{12}\)và\(\frac{3}{12}\)
Vì 3=3 nên \(\frac{3}{12}\)=\(\frac{3}{12}\)
Vậy \(\frac{1}{4}\)=\(\frac{3}{12}\)
b) \(\frac{2}{3}\)và\(\frac{6}{8}\)
\(\frac{16}{24}\)và\(\frac{18}{24}\)
Vì 16<18 nên \(\frac{16}{24}\)<\(\frac{18}{24}\)
Vậy \(\frac{2}{3}\)<\(\frac{6}{8}\)
c) \(\frac{4}{3}\)và\(\frac{-12}{9}\)
\(\frac{12}{9}\)và\(\frac{-12}{9}\)
Vì 12>-12 nên \(\frac{12}{9}\)>\(\frac{-12}{9}\)
Vậy \(\frac{4}{3}\)>\(\frac{-12}{9}\)
d)\(\frac{-3}{5}\)và\(\frac{9}{-15}\)
\(\frac{-9}{15}\)và\(\frac{-9}{15}\)
Vì -9=-9 nên \(\frac{-9}{15}\)=\(\frac{-9}{15}\)
Vậy \(\frac{-3}{5}\)=\(\frac{9}{-15}\)
CHÚC BẠN HỌC TỐT
\(a,\frac{3}{-5}=\frac{-3}{5};b,\frac{-13}{-7}=\frac{13}{7};c,\frac{-4}{8}=\frac{-1}{2};d,\frac{-34}{17}=\frac{-2}{1}\)
a) \(\frac{2}{3} = \frac{4}{6} = \frac{1}{6} + \frac{3}{6} = \frac{1}{6} + \frac{1}{2}\)
b) \(\frac{8}{{15}} = \frac{5}{{15}} + \frac{3}{{15}} = \frac{1}{5} + \frac{1}{3}\)
c) \(\frac{7}{8} = \frac{4}{8} + \frac{2}{8} + \frac{1}{8} = \frac{1}{2} + \frac{1}{4} + \frac{1}{8}\)
d) \(\frac{{17}}{{18}} = \frac{9}{{18}} + \frac{6}{{18}} + \frac{2}{{18}} = \frac{1}{2} + \frac{1}{3} + \frac{1}{9}\).
1/ b/ \(\frac{-a}{-b}=\frac{a}{b}=>\frac{-a}{-b}=\frac{a}{b}\)
2/ \(\frac{3}{-4}=\frac{-3}{4};\frac{-5}{-7}=\frac{5}{7};\frac{2}{-9}=\frac{-2}{9};\frac{-11}{-10}=\frac{11}{10}\)
tik nha chúc m.n zui zẻ trong năm ms!!! HAPPY NEW YEAR 2016!!!!!!!!!!!!
1/ a/ \(\frac{a}{-b}=-\left(\frac{a}{b}\right);\frac{-a}{b}=-\left(\frac{a}{b}\right)=>\frac{a}{-b}=\frac{-a}{b}\)
1.
a) \(\frac{3}{-5}=\frac{3:\left(-1\right)}{-5:\left(-1\right)}=\frac{-3}{5}\) b) \(\frac{-13}{-7}=\frac{-13:\left(-1\right)}{-7:\left(-1\right)}=\frac{13}{7}\)
c) \(\frac{-4}{8}=\frac{-4:4}{8:4}=\frac{-1}{2}\) d)\(\frac{-34}{17}=\frac{-34:17}{17:17}=\frac{-2}{1}\)
2.
a)\(\frac{5}{12}va\frac{10}{12}\) b\(\frac{-3}{12}va\frac{1}{-4}\)
\(\frac{5}{12}\ne\frac{10}{12}\) vì 5.12\(\ne\)10.12 \(\frac{-3}{12}=\frac{1}{-4}\)vì -3.(-4)=1.12
c)\(\frac{4}{1}va\frac{-72}{-18}\)
\(\frac{4}{1}=\frac{-72}{-18}\)vì 4.(-18)=1.(-72)