Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
a ) \(-\frac{3}{7}.\frac{3}{11}+-\frac{3}{7}.\frac{8}{11}+1\frac{3}{7}\)
\(=-\frac{3}{7}.\left(\frac{3}{11}+\frac{8}{11}\right)+\frac{10}{7}\)
\(=-\frac{3}{7}.\frac{11}{11}+\frac{10}{7}\)
\(=-\frac{3}{7}.1+\frac{10}{7}\)
\(=\frac{10}{7}\)
b ) \(75\%.10,5=\frac{3}{4}.10,5=7,875\)
c ) \(5-3.\left(\left|-4\right|-30:15\right)\)
\(=5-3.\left(4-2\right)\)
\(=5-3.2\)
\(=5-6\)
\(=-1\)
d ) \(-\frac{5}{7}.\frac{2}{11}+-\frac{5}{7}.\frac{9}{11}+1\frac{5}{7}\)
\(=-\frac{5}{7}.\left(\frac{2}{11}+\frac{9}{11}\right)+\frac{12}{7}\)
\(=-\frac{5}{7}.1+\frac{12}{7}\)
\(=\frac{7}{7}\)
\(=1\)
Chúc bạn học tốt !!!
Bài 1
a) MC: 75
\(\frac{7}{-15}=\frac{-7}{15}=\frac{-7.5}{15.5}=\frac{-35}{75}\)
\(\frac{-8}{-25}=\frac{8}{25}=\frac{8.3}{25.3}=\frac{24}{75}\)
\(\frac{11}{-75}=\frac{-11}{75}\)
b) MC: 180
Cách làm tương tự
Bài 2:
\(\frac{-1}{8}=\frac{-3}{24}\)
\(\frac{2}{-3}=\frac{16}{-24}=\frac{-16}{24}\)
\(\frac{3}{-72}=\frac{1}{-24}=\frac{-1}{24}\)
\(\frac{5}{-6}=\frac{20}{-24}=\frac{-20}{24}\)
Bài 3:
\(1=\frac{16}{16}\)
\(\frac{5}{-8}=\frac{-10}{16}\)
\(0=\frac{0}{16}\)
a, \(\dfrac{-3}{5}+\dfrac{5}{7}\)
\(=\dfrac{4}{35}\)
b, \(-5+\dfrac{1}{6}\)
= \(\dfrac{-29}{6}\)
c, \(\dfrac{1}{8}-\dfrac{1}{2}\)
= \(\dfrac{-3}{8}\)
c, \(\dfrac{5}{12}-\dfrac{-7}{6}\)
= \(\dfrac{19}{12}\)
d, \(-2.\dfrac{3}{7}\)
= \(\dfrac{-6}{7}\)
\(\frac{2}{7}+\frac{3}{8}+\frac{11}{7}+\frac{1}{3}+\frac{1}{7}+\frac{-5}{8}\)
\(=\left(\frac{2}{7}+\frac{1}{7}+\frac{11}{7}\right)+\left(\frac{3}{8}+\frac{-5}{8}\right)+\frac{1}{3}\\=2+\frac{-1}{4}+\frac{1}{3}\\ =\frac{25}{12}\)