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Câu 1.
$\frac{1}{15}-\frac{9}{15}=\frac{-8}{15}$
$\frac{2}{15}-\frac{10}{15}=\frac{-8}{15}$
$\frac{3}{15}-\frac{11}{15}=\frac{-8}{15}$
Câu 2:
$\frac{-9}{15}+\frac{1}{15}=\frac{-8}{15}$
$\frac{-10}{15}+\frac{2}{15}=\frac{-8}{15}$
$\frac{-11}{15}+\frac{3}{15}=\frac{-8}{15}$
1. a, \(\frac{-4}{15}=\left(\frac{-1}{15}+\frac{-3}{15}\right)=\left(\frac{-2}{15}+\frac{-2}{15}\right)=\left(\frac{-0}{15}+\frac{4}{15}\right)\)
b, \(\frac{-4}{15}=\left(\frac{4}{15}-\frac{8}{15}\right)=\left(\frac{3}{15}-\frac{7}{15}\right)=\left(\frac{5}{15}-\frac{9}{15}\right)\)
2 . \(\frac{-7}{12}=\left(\frac{-1}{12}+\frac{-1}{2}\right)=\left(\frac{-1}{6}+\frac{-5}{12}\right)=\left(\frac{-1}{4}+\frac{-1}{3}\right)\)
b, \(\frac{-7}{12}=\left(\frac{4}{12}-\frac{11}{12}\right)=\left(\frac{1}{12}-\frac{8}{12}\right)=\left(\frac{3}{12}-\frac{10}{12}\right)\)
1/ Cách 1: Ta có: \(\dfrac{-8}{15}\) = \(\dfrac{-1+\left(-7\right)}{15}\) = \(\dfrac{-1}{15}\) + \(\dfrac{-7}{15}\)
Cách 2: Ta có: \(\dfrac{-8}{15}\) = \(\dfrac{-2+\left(-6\right)}{15}\) = \(\dfrac{-2}{15}\) + \(\dfrac{-6}{15}\) = \(\dfrac{-2}{15}\) + \(\dfrac{-2}{5}\)
Cách 3: Ta có: \(\dfrac{-8}{15}\) = \(\dfrac{-3+\left(-5\right)}{15}\) = \(\dfrac{-3}{15}\) + \(\dfrac{-5}{15}\) = \(\dfrac{-1}{5}\) + \(\dfrac{-1}{3}\)
2/ C1: Ta có: \(\dfrac{-8}{15}=\dfrac{10-18}{15}=\dfrac{10}{15}-\dfrac{18}{15}=\dfrac{2}{3}-\dfrac{6}{5}\)
C2: Ta có: \(\dfrac{-8}{15}=\dfrac{1-9}{15}=\dfrac{1}{15}-\dfrac{9}{15}=\dfrac{1}{15}-\dfrac{3}{5}\)
C3: Ta có: \(\dfrac{-8}{15}=\dfrac{5-13}{15}=\dfrac{5}{15}-\dfrac{13}{15}=\dfrac{1}{3}-\dfrac{13}{15}\)
3/C1: Ta có: \(\dfrac{-8}{15}=\dfrac{-16+8}{15}=\dfrac{-16}{15}+\dfrac{8}{15}\)
C2: Ta có: \(\dfrac{-8}{15}=\dfrac{-20+12}{15}=\dfrac{-20}{15}+\dfrac{12}{15}=\dfrac{-4}{3}+\dfrac{4}{5}\)
C3: Ta có:\(\dfrac{-8}{15}=\dfrac{-14+6}{15}=\dfrac{-14}{15}+\dfrac{6}{15}=\dfrac{-14}{15}+\dfrac{2}{5}\)
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a) \(\dfrac{-15}{37}=\dfrac{-12}{37}+\dfrac{-3}{37}\)
b) \(\dfrac{-15}{37}=\dfrac{29}{37}-\dfrac{44}{37}\)
a) \(-\frac{15}{32}=-\frac{1}{4}+\left(-\frac{7}{32}\right)\)
b) \(-\frac{15}{32}=\frac{1}{32}-\frac{1}{2}\)
a) \(-\dfrac{7}{13}=\dfrac{-3}{13}+\dfrac{-4}{13}\)
b) \(-\dfrac{11}{25}=\dfrac{6}{25}-\dfrac{17}{25}\)
a) Cách 1 : \(-\dfrac{7}{13}=\dfrac{-6-7}{13}=-\dfrac{6}{13}-\dfrac{7}{13}\)
Cách 2 : \(-\dfrac{7}{13}=-\dfrac{1}{13}-\dfrac{10}{13}\)
b) Cách 1 : \(-\dfrac{11}{25}=\dfrac{10}{25}-\dfrac{21}{25}\)
Cách 2 : \(-\dfrac{11}{25}=\dfrac{9}{25}-\dfrac{22}{25}\)
a )
\(-\dfrac{7}{15}=-\dfrac{10}{15}+\dfrac{3}{15}\)
b )
\(-\dfrac{7}{15}=\dfrac{1}{15}-\dfrac{8}{15}\)
c )
\(-\dfrac{7}{15}=-\dfrac{3}{15}+\dfrac{4}{15}\) hoặc \(-\dfrac{7}{15}=-\dfrac{1}{5}+\dfrac{4}{15}\)
a) Tổng của 2 số hữu tỉ âm:
\(\dfrac{-7}{15}=\dfrac{-1}{3}+\dfrac{-2}{15}\)
b) Hiệu 2 số hữu tỉ dương:
\(\dfrac{-7}{15}=\dfrac{3}{5}-\dfrac{16}{15}\)
c) Tổng 2 số hữu tỉ âm,trong đó 1 số là -1/5
\(\dfrac{-7}{15}=\dfrac{-1}{5}+\dfrac{-4}{15}\)
b) `-4/15=18/15-22/15`
`-4/15=17/15-7/5`
`-4/15=8/15-4/5`