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(4242:21)x100=20,200
các bạn tick cho mình nha!!!
(4242:100)x21=890,82
tick mình nha Phan Nguyễn Bảo Châu!!!
\(45\left(\frac{7373}{3030}+\frac{7373}{4242}+\frac{7373}{5656}+\frac{7373}{7272}\right)\)
\(=45\left(\frac{73.101}{30.101}+\frac{73.101}{42.101}+\frac{73.101}{56.101}+\frac{73.101}{72.101}\right)\)
\(=45\left(\frac{73}{30}+\frac{73}{42}+\frac{73}{56}+\frac{73}{42}\right)\)
\(=45.73\left(\frac{1}{5.6}+\frac{1}{6.7}+\frac{1}{7.8}+\frac{1}{8.9}\right)\)
\(=45.73\left(\frac{1}{5}-\frac{1}{6}+\frac{1}{6}-\frac{1}{7}+\frac{1}{7}-\frac{1}{8}+\frac{1}{8}-\frac{1}{9}\right)\)
\(=45.73\left(\frac{1}{5}-\frac{1}{9}\right)\)
\(=45.73\left(\frac{9}{45}-\frac{5}{45}\right)\)
\(=45.73.\frac{4}{45}\)
\(=292\)
\(\frac{7}{4}\left(\frac{3333}{1212}+\frac{3333}{2020}+\frac{3333}{3030}+\frac{3333}{4242}\right)\)
\(=\frac{7}{4}\left(\frac{33}{12}+\frac{33}{20}+\frac{33}{30}+\frac{33}{42}\right)\)
\(=\frac{7}{4}\cdot33\cdot\left(\frac{1}{12}+\frac{1}{20}+\frac{1}{30}+\frac{1}{42}\right)\)
\(=\frac{7}{4}\cdot33\cdot\left(\frac{1}{3\cdot4}+\frac{1}{4\cdot5}+\frac{1}{5\cdot6}+\frac{1}{6\cdot7}\right)\)
\(=\frac{7}{4}\cdot33\cdot\left(\frac{1}{3}-\frac{1}{4}+\frac{1}{4}-\frac{1}{5}+\frac{1}{5}-\frac{1}{6}+\frac{1}{6}-\frac{1}{7}\right)\)
\(=\frac{7}{4}\cdot33\cdot\left(\frac{1}{3}-\frac{1}{7}\right)\)
\(=\frac{7}{4}\cdot33\cdot\frac{4}{21}\)
\(=\left(\frac{7}{4}\cdot\frac{4}{21}\right)\cdot33\)
\(=\frac{1}{3}\cdot33=11\)
\(B=45.\left(\frac{7373}{3030}+\frac{7373}{4242}+\frac{7373}{5656}+\frac{7373}{9090}\right)\)
\(B=45.\left(\frac{73}{30}+\frac{73}{42}+\frac{73}{56}+\frac{73}{90}\right)\)
\(B=45.73.\left(\frac{1}{30}+\frac{1}{42}+\frac{1}{56}+\frac{1}{90}\right)\)
\(B=3285.\left(\frac{1}{5.6}+\frac{1}{6.7}+\frac{1}{7.8}+\frac{1}{9.10}\right)\)
\(B=3285.\left(\frac{1}{5}-\frac{1}{6}+\frac{1}{6}-\frac{1}{7}+\frac{1}{7}-\frac{1}{8}+\frac{1}{90}\right)\)
\(B=3285.\left(\frac{1}{5}-\frac{1}{8}+\frac{1}{90}\right)\)
\(B=3285.\frac{31}{360}=\frac{2263}{8}\)
Phân số ở đuôi không chính xác. Bạn viết lại đề chuẩn để mọi người hỗ trợ tốt hơn.
\(45.\left(\frac{7373}{3030}+\frac{7373}{4242}+\frac{7373}{5656}+\frac{7373}{7272}\right)\)
\(=45.\left(\frac{101.73}{101.30}+\frac{101.73}{101.42}+\frac{101.73}{101.56}+\frac{101.73}{101.72}\right)\)
\(=45.\left(\frac{73}{30}+\frac{73}{42}+\frac{73}{56}+\frac{73}{72}\right)\)
\(=45.\left(\frac{73}{5.6}+\frac{73}{6.7}+\frac{73}{7.8}+\frac{73}{8.9}\right)\)
\(=45.73.\left(\frac{1}{5}-\frac{1}{6}+\frac{1}{6}-\frac{1}{7}+\frac{1}{7}-\frac{1}{8}+\frac{1}{8}-\frac{1}{9}\right)\)
\(=45.73.\left(\frac{1}{5}-\frac{1}{9}\right)\)
\(=45.73.\frac{4}{45}\)
\(=73.4\)
\(=292\)
\(7783,\left(018315\right)\)
Số nhỏ nhất có ba chữ số là \(100\)
\(21\times\dfrac{1313}{4242}+21\times\dfrac{6666}{7777}\)
\(=21\times\dfrac{13}{42}+21\times\dfrac{6}{7}\)
\(=21\times\left(\dfrac{13}{42}+\dfrac{6}{7}\right)\)
\(=21\times\dfrac{7}{6}\)
\(=\dfrac{49}{2}\)
21x\(\dfrac{1313}{4242}\)+21x\(\dfrac{6666}{7777}\)
=21x(\(\dfrac{1313}{4242}+\dfrac{6666}{7777}\))
=21x(\(\dfrac{13\times1001}{42\times1001}\)+\(\dfrac{6\times1111}{7\times1111}\))
=21x(\(\dfrac{13}{42}+\dfrac{6}{7}\))
=21x(\(\dfrac{13}{42}+\dfrac{36}{42}\))
=21x\(\dfrac{49}{42}\)
=\(\dfrac{21\times49}{42}\)
=\(\dfrac{1\times49}{2}\)
=\(\dfrac{49}{2}\)