Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
`C=(12/35-6/7+18/14):6/(-7)-(-2)/5-1`
`C=(12/35-6/7+9/7):(-6)/7+2/5-1`
`C=(12/35+3/7):(-6)/7+2/5-1`
`C=(12/35+15/35):(-6)/7+2/5-1`
`C=27/35*(-7)/6+2/5-1`
`C=-9/10+2/5-1`
`C=-9/10+4/10-1`
`C=-1/2-1=-3/2`
Ta có: \(C=\left(\dfrac{12}{35}-\dfrac{6}{7}+\dfrac{18}{14}\right):\dfrac{6}{-7}-\dfrac{-2}{5}-1\)
\(=\left(\dfrac{24}{70}-\dfrac{60}{70}+\dfrac{90}{70}\right):\dfrac{-6}{7}-\dfrac{-2}{5}-\dfrac{5}{5}\)
\(=\dfrac{27}{35}\cdot\dfrac{-7}{6}-\dfrac{3}{5}\)
\(=\dfrac{-3}{2}\)
a)\(\frac{1}{4}.x=-\frac{1}{3}\)
\(x=-\frac{1}{3}:\frac{1}{4}\)
\(x=-\frac{4}{3}\)
b)\(-\frac{3}{7}+x=\frac{5}{8}\)
\(\text{ }x=\frac{5}{8}-\left(-\frac{3}{7}\right)\)
\(x=\frac{59}{56}\)
c)\(\frac{16}{2^x}=2\)
\(2^x=\frac{16}{2}\)
\(2^x=8\)
\(\Rightarrow2^x=2^3\)
vậy x=3
\(-\frac{7}{12}+\frac{11}{8}-\frac{5}{9}\)
= \(-\frac{42}{72}+\frac{99}{72}-\frac{40}{72}\)
= \(\frac{17}{72}\)
Chúc bạn học tốt !!!
\(-\frac{7}{12}+\frac{11}{8}-\frac{5}{9}\)
\(=\frac{-14+33}{24}-\frac{5}{9}\)
\(=\frac{19}{24}-\frac{5}{9}=\frac{57-40}{72}=\frac{17}{72}\)
1,
\(\frac{25}{12}+\left(\frac{-4}{12}\right)=\frac{7}{4}\)
\(\frac{-10}{8}+\frac{15}{4}=\frac{5}{2}\)
\(\frac{3}{8}+\frac{-14}{6}=\frac{-47}{24}\)
\(\frac{350}{150}+\left(\frac{-200}{360}\right)=\frac{16}{9}\)
\([\frac{5}{8}+\left(\frac{-3}{4}\right)]+\frac{15}{6}=\frac{-1}{8}+\frac{15}{6}=\frac{19}{8}\)
\(\frac{7}{3}+[\left(\frac{-5}{6}\right)+\left(\frac{-2}{3}\right)]=\frac{7}{3}+\left(\frac{-3}{2}\right)=\frac{5}{6}\)
-7/12+5/8
=1/24
HT
=1/24