1)Công ,trừ ,phân chia hai phân số
a)\(\frac{\left(-3\right)}{16}+\frac{1}{15}\) b) \(\frac{\left(-15\right)}{24}-\frac{\left(-2\right)}{6}\)
c)\(\frac{\left(-16\right)}{18}.\frac{36}{\left(-40\right)}\) d) \(\frac{\left(-17\right)}{30}:\frac{34}{60}\)
2) Đổi hỗn số thành phân số rồi tính kết quả
a) \(1\frac{3}{5}+2\frac{1}{6}\) b)\(3\frac{1}{7}-1\frac{1}{8}\) c) \(3\frac{1}{6}.2\frac{1}{4}\) d) \(4\frac{1}{5}:3\frac{6}{7}\)
Mình đang cần gấp
Bài 1:
a) \(\frac{\left(-3\right)}{16}+\frac{1}{15}=\frac{-45}{240}+\frac{16}{240}\)
\(=\frac{-29}{240}\)
b)\(\frac{\left(-15\right)}{24}-\frac{\left(-2\right)}{6}=\frac{\left(-15\right)}{24}-\frac{-8}{24}\)
\(=\frac{-7}{24}\)
c) \(\frac{\left(-16\right)}{18}\cdot\frac{36}{\left(-40\right)}=\frac{\left(-8\right)}{9}\cdot\frac{\left(-9\right)}{10}\)
\(=\frac{\left(-80\right)}{90}\cdot\frac{\left(-81\right)}{90}\)
\(=\frac{4}{5}\)
d)\(\frac{\left(-17\right)}{30}:\frac{34}{60}=\frac{\left(-17\right)}{30}:\frac{17}{30}\)
\(=\frac{\left(-17\right)}{30}\cdot\frac{30}{17}\)
\(=-1\)
Bài 2:
a) \(1\frac{3}{5}+2\frac{1}{6}=\frac{8}{5}+\frac{13}{6}=\frac{48}{30}+\frac{65}{30}\)
\(=\frac{113}{30}\)
b) \(3\frac{1}{7}-1\frac{1}{8}=\frac{22}{7}-\frac{9}{8}=\frac{176}{56}-\frac{63}{56}\)
\(=\frac{113}{56}\)
c) \(3\frac{1}{6}\cdot2\frac{1}{4}=\frac{19}{6}\cdot\frac{9}{4}=\frac{57}{8}\)
d) \(4\frac{1}{5}:3\frac{6}{7}=\frac{21}{5}:\frac{27}{7}=\frac{21}{5}\cdot\frac{7}{27}\)
\(=\frac{49}{45}\)
a \(\frac{-3}{16}+\frac{1}{15}=\frac{-45}{240}+\frac{16}{240}=\frac{-29}{240}\)
b \(\frac{-15}{24}-\frac{-2}{6}=\frac{-15}{24}-\frac{-8}{24}=\frac{-7}{24}\)
c \(\frac{-16}{18}.\frac{36}{-40}=\frac{4}{5}\)
d \(\frac{-17}{30}:\frac{34}{60}=\frac{-17}{30}.\frac{60}{34}=-1\)
bai 2
\(1\frac{3}{5}+2\frac{1}{6}=\frac{8}{5}+\frac{13}{6}=\frac{113}{30}\)
\(3\frac{1}{7}-1\frac{1}{8}=\frac{22}{7}-\frac{9}{8}=\frac{113}{56}\)
c \(3\frac{1}{6}.2\frac{1}{4}=\frac{19}{6}.\frac{9}{4}=\frac{57}{8}\)
d \(4\frac{1}{5}:3\frac{6}{7}=\frac{21}{5}:\frac{27}{7}=\frac{21}{5}.\frac{7}{27}=\frac{147}{135}\)
