Đề này dễ mà
\(\dfrac{-3}{7}\).\(\dfrac{14}{15}\)
=-1.\(\dfrac{2}{5}\)
=\(\dfrac{-2}{5}\)
Đúng 0
Bình luận (2)
Ôn tập toán 6
Các câu hỏi tương tự
tính
dfrac{-5}{8}:dfrac{15}{4} dfrac{-15}{17}:dfrac{25}{-34} -48:(dfrac{-24}{5}) dfrac{-30}{7}:(dfrac{-5}{-14})
dfrac{15}{28}:(dfrac{-9}{14}) dfrac{-7}{40}:(-dfrac{21}{20}) (dfrac{-4}{15}).(-dfrac{-25}{8}) dfrac{5}{-14}.(-dfrac{7}{10})
dfrac{-15}{4}.(-dfrac{16}{25}) 15.(-dfrac{13}{10}) (-dfrac{14}{5}).-10 (dfrac{3}{-10}).(-dfrac{-15}{2})
Đọc tiếp
tính
\(\dfrac{-5}{8}:\dfrac{15}{4}\) \(\dfrac{-15}{17}:\dfrac{25}{-34}\) \(-48:(\dfrac{-24}{5})\) \(\dfrac{-30}{7}:(\dfrac{-5}{-14})\)
\(\dfrac{15}{28}:(\dfrac{-9}{14})\) \(\dfrac{-7}{40}:(-\dfrac{21}{20})\) \((\dfrac{-4}{15}).(-\dfrac{-25}{8})\) \(\dfrac{5}{-14}.(-\dfrac{7}{10})\)
\(\dfrac{-15}{4}.(-\dfrac{16}{25})\) \(15.(-\dfrac{13}{10})\) \((-\dfrac{14}{5}).-10\) \((\dfrac{3}{-10}).(-\dfrac{-15}{2})\)
BT2: Tính nhanh
15) \(\left(\dfrac{1}{2}-\dfrac{13}{14}\right):\dfrac{5}{7}-\left(-\dfrac{2}{21}+\dfrac{1}{7}\right):\dfrac{5}{7}\)
16)\(\dfrac{3}{5}:\left(\dfrac{-1}{15}-\dfrac{1}{6}\right)+\dfrac{3}{5}:\left(\dfrac{-1}{3}-1\dfrac{1}{15}\right)\)
tính hợp lí:
a)\(\left(4\dfrac{5}{37}-3\dfrac{4}{5}+8\dfrac{15}{29}\right)-\left(3\dfrac{5}{37}-6\dfrac{14}{29}\right)\)
b) \(60\dfrac{7}{13}+50\dfrac{8}{13}-11\dfrac{2}{13}\)
c) \(\dfrac{\dfrac{2}{3}+\dfrac{2}{7}-\dfrac{1}{14}}{-1-\dfrac{3}{7}+\dfrac{3}{28}}\)
Thực hiện phép tính:
\(\dfrac{-5}{12}.\dfrac{2}{7}+\dfrac{7}{12}:\dfrac{-14}{3}\)
b) 1,4.\(\dfrac{15}{49}-\left(80\%+\dfrac{2}{3}\right):2\dfrac{1}{5}\)
Tính:
1) ( 2dfrac{3}{17} - 2dfrac{3}{5} ) + ( -2dfrac{3}{17} - 1dfrac{2}{5} )
2) ( 2dfrac{7}{15} - 3dfrac{3}{7} ) - ( -dfrac{9}{21} + 3dfrac{7}{15} )
3) ( 2dfrac{7}{19} + 5dfrac{3}{7} ) + (-dfrac{14}{38} + 1dfrac{4}{7} )
Giúp mình nhé!!!!
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Tính:
1) ( 2\(\dfrac{3}{17}\) - 2\(\dfrac{3}{5}\) ) + ( -2\(\dfrac{3}{17}\) - 1\(\dfrac{2}{5}\) )
2) ( 2\(\dfrac{7}{15}\) - 3\(\dfrac{3}{7}\) ) - ( -\(\dfrac{9}{21}\) + 3\(\dfrac{7}{15}\) )
3) ( 2\(\dfrac{7}{19}\) + 5\(\dfrac{3}{7}\) ) + (-\(\dfrac{14}{38}\) + 1\(\dfrac{4}{7}\) )
Giúp mình nhé!!!!
Thực hiện phép tính
a) \(\dfrac{1}{2}.\left(\dfrac{2}{9}+\dfrac{3}{7}-\dfrac{5}{27}\right)\) b) \(\left(\dfrac{-5}{28}+1,75+\dfrac{8}{35}\right):\left(-3\dfrac{9}{20}\right)\)
c) \(\dfrac{1}{3}.\dfrac{5}{7}-\dfrac{7}{27}.\dfrac{36}{14}\) d) \(70,5-528:\dfrac{15}{2}\)
) Thực hiện phép tính nhanh nhất nếu có thể:
a)
dfrac{2}{7}+dfrac{7}{7}.dfrac{14}{25}
b)
dfrac{6}{7}+dfrac{5}{7}:5-dfrac{8}{9}
c)
left(dfrac{-5}{28}+1,75+dfrac{8}{35}right):left(-3dfrac{9}{20}right)
d)70,5-528:dfrac{15}{2}
e)dfrac{-7}{25}.dfrac{39}{-14}.dfrac{50}{78}
Đọc tiếp
) Thực hiện phép tính nhanh nhất nếu có thể:
a)
\(\dfrac{2}{7}+\dfrac{7}{7}.\dfrac{14}{25}\)
b)
\(\dfrac{6}{7}+\dfrac{5}{7}:5-\dfrac{8}{9}\)
c)
\(\left(\dfrac{-5}{28}+1,75+\dfrac{8}{35}\right):\left(-3\dfrac{9}{20}\right)\)
d)\(70,5-528:\dfrac{15}{2}\)
e)\(\dfrac{-7}{25}.\dfrac{39}{-14}.\dfrac{50}{78}\)
cho :
\(\dfrac{\dfrac{2}{3}n+\dfrac{1}{5}\cdot\dfrac{3}{7}+\dfrac{1}{7}\cdot\dfrac{3}{10}+\dfrac{1}{3}n-\dfrac{1}{14}+\dfrac{33}{35}}{\dfrac{2}{3}\cdot\left(3n+\dfrac{3}{5}\right)\dfrac{14}{15}+\dfrac{1}{3}}\)
a, Hãy rút gọn A.
b,Tìm giá trị của A khi n =\(\dfrac{-1}{5}\)
c,Tìm n để A nhận giá trị là \(\dfrac{2}{5}\)
d,Tìm n để 2A thuộc Z
BT3: Tìm x, biết
13) \(\left(-1\dfrac{1}{5}+x\right):\left(-3\dfrac{3}{5}\right)=\dfrac{-7}{4}+\dfrac{1}{4}:\dfrac{1}{8}\)
14) \(\dfrac{11}{13}-\left(\dfrac{5}{42}-x\right)=-\left(\dfrac{15}{28}-\dfrac{11}{13}\right)\)