5 - 14= ??? giúp mình với nha
3
Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
\(\frac{3}{7}+\frac{2}{21}-\frac{3}{14}\)
\(=\frac{11}{21}-\frac{3}{14}=\frac{13}{42}\)
\(\frac{5}{4}-\frac{5}{12}+\frac{3}{8}\)
\(=\frac{5}{6}+\frac{3}{8}=\frac{29}{24}\)
\(\frac{7}{12}.\frac{8}{21}:\frac{2}{3}\)
\(=\frac{2}{9}:\frac{2}{3}=\frac{1}{3}\)
a: =152,3+7,7+2021,19-2021,19
=160
b: =7/15*3/14*20/13
\(=\dfrac{7}{14}\cdot\dfrac{3}{15}\cdot\dfrac{20}{13}=\dfrac{1}{2}\cdot\dfrac{1}{5}\cdot\dfrac{20}{13}=\dfrac{2}{13}\)
c: \(=\dfrac{7}{4}\left(\dfrac{13}{12}-\dfrac{10}{12}\right)+\dfrac{5}{6}=\dfrac{7}{16}+\dfrac{5}{6}=\dfrac{61}{48}\)
Mn ơi cho mình hỏi tick kiểu gì ạ mình mới dùng web này nên ko biết
Ta có:
\(\frac{4}{3}+\frac{3}{7}:\frac{5}{14}\)
\(=\frac{4}{3}+\left(\frac{3}{7}:\frac{5}{14}\right)\)
\(=\frac{4}{3}+\left(\frac{3}{7}×\frac{14}{5}\right)\)
\(=\frac{4}{3}+\left(\frac{3×14}{7×5}\right)\)
\(=\frac{4}{3}+\left(\frac{3×7×2}{7×5}\right)\)
\(=\frac{4}{3}+\left(\frac{3×2}{5}\right)\)
\(=\frac{4}{3}+\frac{6}{5}\)
\(=\frac{4×5}{3×5}+\frac{6×3}{5×3}\)
\(=\frac{20}{15}+\frac{18}{15}\)
\(=\frac{20+18}{15}\)
\(=\frac{38}{15}\)
\(\frac{4}{3}+\frac{3}{7}\)\(:\frac{5}{14}\)
\(=\frac{4}{3}+\frac{3}{7}\times\frac{14}{5}\)
\(=\frac{4}{3}+\frac{6}{9}\)
\(=\frac{20}{15}+\frac{18}{15}\)
\(=\frac{38}{15}\)
a) Ta có: \(7\cdot\dfrac{3}{14}-\dfrac{1}{14}\)
\(=\dfrac{3}{2}-\dfrac{1}{14}\)
\(=\dfrac{21}{14}-\dfrac{1}{14}\)
\(=\dfrac{10}{7}\)
b) Ta có: \(\dfrac{3}{2}+\dfrac{7}{4}:\dfrac{5}{2}\)
\(=\dfrac{3}{2}+\dfrac{7}{4}\cdot\dfrac{2}{5}\)
\(=\dfrac{3}{2}+\dfrac{7}{10}\)
\(=\dfrac{15}{10}+\dfrac{7}{10}=\dfrac{22}{10}=\dfrac{11}{5}\)
Lời giải:
\(7\times \frac{3}{14}-\frac{1}{14}=\frac{7\times 3}{14}-\frac{1}{14}=\frac{21}{14}-\frac{1}{14}=\frac{21-1}{14}=\frac{20}{14}=\frac{2\times 10}{2\times 7}=\frac{10}{7}\)
\(\frac{3}{2}+\frac{7}{4}:\frac{5}{2}=\frac{3}{2}+\frac{7}{4}\times \frac{2}{5}=\frac{3}{2}+\frac{7\times 2}{4\times 5}=\frac{3}{2}+\frac{7\times 2}{2\times 2\times 5}\)
\(=\frac{3}{2}+\frac{7}{2\times 5}=\frac{3\times 5}{2\times 5}+\frac{7}{2\times 5}=\frac{3\times 5+7}{2\times 5}=\frac{22}{2\times 5}=\frac{2\times 11}{2\times 5}=\frac{11}{5}\)
= -9 nhaa
Bằng -9 nha bạn