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-11/15.20/23+-11/15.3/23+-34/15
\(=\frac{-11}{15}\left(\frac{20}{23}+\frac{3}{23}\right)+\frac{-34}{15}\)
\(=\frac{-11}{15}.1+\frac{-34}{15}\)
\(=\frac{-45}{15}=-3\)
\(\frac{-11}{15}.\frac{20}{23}+\frac{-11}{15}.\frac{3}{23}+\frac{-34}{15}\)
\(=\frac{-11}{15}.\left(\frac{20}{23}+\frac{3}{23}\right)+\frac{-34}{15}\)
\(=\frac{-11}{15}.1+\frac{-34}{15}\)
\(=\frac{-11+\left(-34\right)}{15}\)
\(=\frac{-45}{15}\)
\(=-3\)
Study well ! >_<
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Câu a:
Ta thấy 37 - 37 = 0
nên nhóm lại kết quả là 14 + 26 = 40
Câu b:
tương tự, kết quả là 6 + 10 = 16
Các câu còn lại như vậy
( -37)+14 +26 +37
=( -37 )+ 37 + (14 + 26 )
=0 +40 = 40
- 24 + 6 +10 +24
=( -24 ) + 24 +( 6 + 10 )
=0 + 16 = 16
15 + 23 + (-25 ) + ( -23 )
= 15 + ( -25 ) + 23 +( -23 )
= -10 + 0
= - 10
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a: \(=\dfrac{-3}{7}+\dfrac{15}{26}-\dfrac{2}{13}+\dfrac{3}{7}=\dfrac{15}{26}-\dfrac{4}{26}=\dfrac{11}{26}\)
b: \(=\dfrac{6}{7}+\dfrac{2}{9}-\dfrac{10}{7}-5=\dfrac{-4}{7}-5+\dfrac{2}{9}=-\dfrac{337}{63}\)
c: \(=-\dfrac{11}{23}\left(\dfrac{6}{7}+\dfrac{8}{7}\right)-\dfrac{1}{23}=\dfrac{-22}{23}-\dfrac{1}{23}=-1\)