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\(=\dfrac{8}{11}\left(\dfrac{19}{35}+\dfrac{16}{35}\right)-\dfrac{9}{11}=\dfrac{8}{11}-\dfrac{9}{11}=-\dfrac{1}{11}\)
d: \(=\dfrac{-7}{9}\left(\dfrac{3}{11}+\dfrac{8}{11}\right)+1+\dfrac{7}{9}=1\)
e: \(=\dfrac{1}{5}\left(\dfrac{10}{19}+\dfrac{9}{19}\right)-\dfrac{2}{35}=\dfrac{1}{5}-\dfrac{2}{35}=\dfrac{5}{35}=\dfrac{1}{7}\)
f: \(=\left(-25\cdot4\right)\cdot\left(-8\cdot125\right)\cdot\left(-17\right)=-1700000\)
\(-\frac{12}{35}\div\frac{7}{11}-\frac{23}{35}\div\frac{7}{11}-\frac{5}{11}\)
\(=\left(-\frac{12}{35}-\frac{23}{35}\right)\div\frac{7}{11}-\frac{5}{11}\)
\(=-1\div\frac{7}{11}-\frac{5}{11}\)
\(=-\frac{11}{7}-\frac{5}{11}\)
\(=-\frac{156}{77}\)
\(\dfrac{19}{28}+\dfrac{23}{47}-\dfrac{15}{8}+\dfrac{9}{28}+\dfrac{24}{47}\)
\(=\left(\dfrac{19}{28}+\dfrac{9}{28}\right)+\left(\dfrac{23}{47}+\dfrac{24}{47}\right)-\dfrac{15}{8}\)
\(=\dfrac{28}{28}+\dfrac{47}{47}-\dfrac{15}{8}\)
\(=1+1-\dfrac{15}{8}\)
\(=\dfrac{1}{8}\)
____________________
\(\dfrac{30}{11}+\dfrac{12}{35}-\dfrac{19}{11}-\dfrac{2}{35}-\dfrac{2}{7}\)
\(=\left(\dfrac{30}{11}-\dfrac{19}{11}\right)+\left(\dfrac{12}{35}-\dfrac{2}{35}\right)-\dfrac{2}{7}\)
\(=\dfrac{11}{11}+\dfrac{10}{35}-\dfrac{2}{7}\)
\(=1+\dfrac{2}{7}-\dfrac{2}{7}\)
\(=1\)
`A)15/9=(5 xx 3)/(3 xx 3)=5/3`
`60/(-96)=(5 xx 12)/(12 xx (-8))=-5/8`
`=>5/3=15/9`
Ta thấy trừ cặp `5/3=15/9` thì còn lại không bằng nhau.
`B)60/(-85)=(5 xx 12)/(5 xx (-17))=-12/17`
`-77/56=(7 xx (-11))/(8 xx 7)=-11/8`
`=>-12/17=60/(-85)`
Ta thấy trừ cặp `-12/17=60/(-85)` thì còn lại không bằng nhau.
a) \(\dfrac{15}{9}=\dfrac{5}{3}\)
b) \(-\dfrac{12}{17}=\dfrac{60}{-85}\)
(-37 - 17).(-9) + 35.(-9 - 11)
= (-54).(-9) + 35.(-20)
= 54.9 - 35.20
= 486 - 700
= -214
\(\text{(–37–17). (–9) + 35. (–9–11)}\)
\(=37.9+17.9-35.9-35.11\)
\(=9.\left(37+17-35\right)-35.11\)
\(=9.19-385\)
\(=171-385\)
\(=-214\)
chúc bạn học tốt
a,(-37-17).(-9)+35.(-9-11)
=(-54).(-9)+35.(-20)
=486-700
=-214