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Bài này dễ:=\(\frac{3}{5}\)x \(\frac{1}{\frac{-1}{15}-\frac{1}{6}}\)+\(\frac{3}{5}\)x \(\frac{1}{\frac{-1}{3}-\frac{16}{15}}\).Tự giải tiếp nhé,nhớ chọn cho Long đẹp trai này nhé!
`3/5:(-1/15-1/6)+3/5:(-1/3-1 1/15)`
`=3/5:[-7]/30+3/5:[-7]/5`
`=3/5 . [-30]/7+3/5 . [-5]/7`
`=3/5 .([-30]/7+[-5]/7)`
`=3/5 . [-5]=-3`
\(\dfrac{3}{5}:\left(-\dfrac{1}{15}-\dfrac{1}{6}\right)+\dfrac{3}{5}:\left(-\dfrac{1}{3}-1\dfrac{1}{15}\right)\)
\(=\dfrac{3}{5}:\left(-\dfrac{6}{90}-\dfrac{15}{90}\right)+\dfrac{3}{5}:\left(-\dfrac{1}{3}-\dfrac{16}{15}\right)\)
\(=\dfrac{3}{5}:\dfrac{-7}{30}+\dfrac{3}{5}:\left(-\dfrac{5}{15}-\dfrac{16}{15}\right)\)
\(=\dfrac{3}{5}:\dfrac{-7}{30}+\dfrac{3}{5}:\dfrac{-7}{5}\)
\(=\dfrac{3}{5}\times\dfrac{-30}{7}+\dfrac{3}{5}\times\dfrac{-5}{7}\)
\(=\dfrac{3}{5}\times\left(\dfrac{-30}{7}+\dfrac{-5}{7}\right)\)
\(=\dfrac{3}{5}\times\left(-5\right)\)
\(=-3\)
3/5:(-1/15-1/6)+3/5:(-1/3-11/5)
=5/3 x(-1/15-1/6)+5/3 x(-1/3-11/5)
=5/3(-1/15-1/6-1/3-11/5)
=5/3 x(-83/30)
=-83/18
a, (\(\dfrac{9}{10}\) - \(\dfrac{15}{16}\)) \(\times\) ( \(\dfrac{5}{12}\) - \(\dfrac{11}{15}\) - \(\dfrac{7}{20}\))
= (\(\dfrac{72}{80}\) - \(\dfrac{75}{80}\)) \(\times\) (\(\)\(\dfrac{25}{60}\) - \(\dfrac{44}{60}\) - \(\dfrac{21}{60}\))
= - \(\dfrac{3}{80}\) \(\times\) (- \(\dfrac{2}{3}\))
= \(\dfrac{1}{40}\)
b, (-1)3 + (- \(\dfrac{2}{3}\))2 : 2\(\dfrac{2}{3}\) + \(\dfrac{5}{6}\)
= -13 + \(\dfrac{4}{9}\) : \(\dfrac{8}{3}\) + \(\dfrac{5}{6}\)
= -1 + \(\dfrac{4}{9}\) \(\times\) \(\dfrac{3}{8}\) + \(\dfrac{5}{6}\)
= -1 + \(\dfrac{1}{6}\) + \(\dfrac{5}{6}\)
= -1 + 1
= 0
\(\dfrac{3}{5}:\left(\dfrac{-1}{15}-\dfrac{1}{6}\right)+\dfrac{3}{5}:\left(\dfrac{-1}{3}-\dfrac{16}{15}\right)\)
\(=\dfrac{3}{5}:\dfrac{-4}{15}+\dfrac{3}{5}:\dfrac{-7}{5}\)
\(=\dfrac{3}{5}.\dfrac{-15}{4}+\dfrac{3}{5}.\dfrac{-5}{7}\)
\(=\dfrac{3}{5}.\left(\dfrac{-15}{4}+\dfrac{-5}{7}\right)\)
\(=\dfrac{3}{5}.\dfrac{85}{28}\)
\(=\dfrac{51}{28}\)
Tick mk tiếp nha !!! (mk ko chắc là đúng đâu, nhớ tính lại nhé )
\(\frac{6}{5}-\frac{1}{4}+\frac{4}{5}-\frac{3}{4}\)
\(=\left(\frac{6}{5}+\frac{4}{5}\right)-\left(\frac{1}{4}+\frac{3}{4}\right)\)
\(=2-1\)
\(=1\)
\(\frac{7}{9}-\frac{5}{12}+\frac{2}{9}-\frac{7}{12}\)
\(=\left(\frac{7}{9}+\frac{2}{9}\right)-\left(\frac{5}{12}+\frac{7}{12}\right)\)
\(=1-1\)
\(=0\)
các câu sau tương tự
A=1
B=0
C=ÂM 8/15
D=0
E=2
F=3/2
H=2/3
LẦN SAU CHO KHÓ SÍU NHA LỚP 5 CŨNG LÀM ĐC
\(\frac{3}{5}:\left(-\frac{1}{15}-\frac{1}{6}\right)+\frac{3}{5}:\left(-\frac{1}{3}-\frac{16}{15}\right)\)
\(=\frac{3}{5}:\left(-\frac{7}{30}\right)+\frac{3}{5}:\left(-\frac{7}{5}\right)\)
\(=\frac{3}{5}.\left(-\frac{30}{7}\right)+\frac{3}{5}.\left(-\frac{5}{7}\right)\)
\(=\frac{3}{5}\left(-\frac{30}{7}-\frac{5}{7}\right)\)
\(=\frac{3}{5}.\left(-\frac{35}{7}\right)\)
\(=-3\)
3 5 : − 1 1 15 − 1 6 + 3 5 : − 1 3 − 1 1 15 = 3 5 : − 16 15 − 1 6 + 3 5 : − 1 3 − 16 15 = 3 5 : − 37 30 + 3 5 : 7 5 = 3 5 . − 30 37 + 3 5 . 5 7 = − 18 37 + 3 7 = − 12 259