d, \(\left(-\frac{3}{4}+\frac{2}{5}\right):\frac{3}{7}+\left[\frac{3}{5}+\left(-\frac{1}{4}\right)\right]:\frac{3}{7}\)
\(=\frac{7}{20}:\frac{3}{7}+\frac{7}{20}:\frac{3}{7}\)
\(=0\)
3/5/7 là hỗn số nhé ba năm phần bảy
tương tự như mấy câu khác nhé
a,\(-0,35.\frac{3}{14}.\left(-3\frac{5}{7}\right)\left(-\frac{4}{21}\right)\)
\(=-\frac{7}{20}.\frac{3}{14}.\left(-\frac{26}{7}\right).\left(-\frac{4}{21}\right)\)
\(=\left[-\frac{7}{20}.\left(-\frac{26}{7}\right)\right].\left[\frac{3}{14}.\left(-\frac{4}{21}\right)\right]\)
\(=\frac{13}{10}.\left(-\frac{2}{49}\right)\)
\(=\frac{13}{5}.\left(-\frac{1}{49}\right)\)
\(=-\frac{13}{245}\)
b, \(=-\frac{3}{7}.\frac{5}{11}+\left(-\frac{5}{14}\right).\frac{5}{11}\)
\(=\frac{5}{11}\left[-\frac{3}{7}+\left(-\frac{5}{14}\right)\right]\)
\(=\frac{5}{11}.\left(-\frac{1}{14}\right)\)
\(=-\frac{5}{154}\)
c, \(5-2\frac{1}{3}:\left(\frac{4}{9}-\frac{1}{6}\right)\)
\(=5-\frac{7}{3}:\frac{5}{18}\)
\(=5-\frac{42}{5}\)
\(=-\frac{17}{5}\)
Bài 1:
c) \(5-2\frac{1}{3}:\left(\frac{4}{9}-\frac{1}{6}\right)\)
\(=5-\frac{7}{3}:\frac{5}{18}\)
\(=5-\frac{42}{5}\)
\(=-\frac{17}{5}.\)
d) \(\left(-\frac{3}{4}+\frac{2}{5}\right):\frac{3}{7}+\left[\frac{3}{5}+\left(-\frac{1}{4}\right)\right]:\frac{3}{7}\)
\(=-\frac{7}{20}:\frac{3}{7}+\frac{7}{20}:\frac{3}{7}\)
\(=\left[\left(-\frac{7}{20}\right)+\frac{7}{20}\right]:\frac{3}{7}\)
\(=0:\frac{3}{7}\)
\(=0.\)
Chúc bạn học tốt!
