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Bài 1:
a) \(3\dfrac{4}{5}.\left(-1\dfrac{1}{2}\right)+3\dfrac{4}{5}.2\dfrac{1}{2}-1\dfrac{4}{7}\)
\(=\dfrac{19}{5}.\left(\dfrac{-3}{2}+\dfrac{5}{2}\right)-\dfrac{11}{7}\)
\(=\dfrac{19}{5}.1-\dfrac{11}{7}\)
\(=\dfrac{19}{5}-\dfrac{11}{7}\)
\(=\dfrac{78}{35}\)
b) \(\dfrac{3}{4}:\left(-2\dfrac{1}{2}\right)-\dfrac{4}{5}:\left(-2\dfrac{1}{2}\right)+1\dfrac{1}{4}:\left(-2\dfrac{1}{2}\right)\)
\(=\left(\dfrac{3}{4}-\dfrac{4}{5}+\dfrac{5}{4}\right):\dfrac{-5}{2}\)
\(=\dfrac{6}{5}:\dfrac{-5}{2}\)
\(=\dfrac{-12}{25}\)
c) \(\dfrac{4}{5}-\left[\dfrac{3}{5}.\left(\dfrac{-2}{3}-1\dfrac{1}{3}\right)+\dfrac{4}{7}\right]\)
\(=\dfrac{4}{5}-\left[\dfrac{3}{5}.\left(\dfrac{-2}{3}-\dfrac{4}{3}\right)+\dfrac{4}{7}\right]\)
\(=\dfrac{4}{5}-\left[\dfrac{3}{5}.-2+\dfrac{4}{7}\right]\)
\(=\dfrac{4}{5}-\left[\dfrac{-6}{5}+\dfrac{4}{7}\right]\)
\(=\dfrac{4}{5}-\left(\dfrac{-22}{35}\right)\)
\(=\dfrac{10}{7}\)
Bài 2:
a) \(\left(\dfrac{3}{4}-x\right).\dfrac{1}{2}-\dfrac{4}{5}=1\dfrac{1}{5}\)
\(\left(\dfrac{3}{4}-x\right).\dfrac{1}{2}=\dfrac{6}{5}+\dfrac{4}{5}\)
\(\left(\dfrac{3}{4}-x\right).\dfrac{1}{2}=2\)
\(\dfrac{3}{4}-x=2:\dfrac{1}{2}\)
\(\dfrac{3}{4}-x=4\)
\(x=\dfrac{3}{4}-4\)
\(x=\dfrac{-13}{4}\)
b) \(\dfrac{3}{4}-\dfrac{1}{4}.x=2\dfrac{1}{3}\)
\(\dfrac{1}{4}.x=\dfrac{3}{4}-\dfrac{7}{3}\)
\(\dfrac{1}{4}.x=\dfrac{-19}{12}\)
\(x=\dfrac{-19}{12}:\dfrac{1}{4}\)
\(x=\dfrac{-19}{3}\)
1. is flying
2. doesn't often write
3. does...have
4. are...skipping
5. is sleeping
6. doesn't have
7. are you doing
8. goes
1. is flying
2. doesn't often write
3. does ... have
4. is skipping
5. is sleeping
6. doesn't have
7. are you doing
8. goes
các bạn ơi, câu này làm kiểu j zị, giúp mik với, các bạn nhanh nhé, mik đang cần gấp đấy
\(c,\overline{735a2b}⋮̸2;⋮5\Rightarrow b=5\\ \Rightarrow\overline{735a25}⋮9\\ \Rightarrow7+3+5+a+2+5⋮9\\ \Rightarrow22+a⋮9\\ \Rightarrow a=5\\ \Rightarrow\overline{735a2b}=735525\\ b,\overline{5a27b}⋮2;⋮5\Rightarrow b=0\\ \Rightarrow\overline{5a270}⋮9\\ \Rightarrow5+a+2+7+0⋮9\\ \Rightarrow14+a⋮9\\ \Rightarrow a=4\\ \Rightarrow\overline{5a27b}=54270\)