Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
Ta có :\(\frac{-5}{12}=\frac{-25}{60}\) \(\frac{7}{-10}=\frac{-42}{60}\)
Vì \(\frac{-25}{60}>\frac{-42}{60}\)
Nên \(\frac{-5}{12}>\frac{7}{-10}\)
\(=\left(-0,37+\frac{14}{8}\right).\left(-1.1\right)-\left(2,63-\frac{9}{24}\right).\left(-1,1\right)\)
\(=-1,1.\left(-0,37+\frac{14}{8}-2,63+\frac{9}{24}\right)\)
\(=-1,1.\left[\left(-0,37-2,63\right)+\left(\frac{14}{8}+\frac{9}{24}\right)\right]\)
\(=-1,1.\left[\left(-3\right)+\left(\frac{14}{8}+\frac{3}{8}\right)\right]\)
\(=-1,1.\left(-3+\frac{17}{8}\right)\)
\(=-1,1.\left(-\frac{7}{8}\right)\)
\(=\frac{77}{80}\)
\(a)\) \(\left(-12\right)\left(x-5\right)+7\left(3-x\right)=5\)
\(\Leftrightarrow\)\(\left(-12\right)x+60+21-7x=5\)
\(\Leftrightarrow\)\(\left(-12\right)x-7x=5-60-21\)
\(\Leftrightarrow\)\(x\left(-12-7\right)=-76\)
\(\Leftrightarrow\)\(x.\left(-19\right)=-76\)
\(\Leftrightarrow\)\(x=\frac{-76}{-19}\)
\(\Leftrightarrow\)\(x=4\)
Vậy \(x=4\)
\(b)\) \(\left(x-2\right)\left(x+4\right)=0\)
\(\Leftrightarrow\)\(\orbr{\begin{cases}x-2=0\\x+4=0\end{cases}}\)
\(\Leftrightarrow\)\(\orbr{\begin{cases}x=2\\x=-4\end{cases}}\)
Vậy \(x\in\left\{2;-4\right\}\)
5/6 - 7/4 .|-2x - 3/2| = 7/12
7/4 .|-2x - 3/2| = 5/6 - 7/12
7/4.|-2x - 3/2| = 1/4
|-2x- 3/2| = 1/4 : 7/4
|-2x - 3/2| = 1/7
\(\Rightarrow\orbr{\begin{cases}-2x-\frac{3}{2}=\frac{1}{7}\\-2x-\frac{3}{2}=-\frac{1}{7}\end{cases}}\Rightarrow\orbr{\begin{cases}-2x=\frac{23}{14}\\-2x=\frac{19}{14}\end{cases}}\Rightarrow\orbr{\begin{cases}x=-\frac{23}{28}\\x=-\frac{19}{28}\end{cases}}\)
\(\frac{7}{6}+\frac{5}{6}:5-\frac{3}{8}.\left(-3\right)^2\)
\(=\frac{7}{6}+\frac{5}{6}.\frac{1}{5}-\frac{3}{8}.9\)
\(=\frac{7}{6}+\frac{1}{6}-\frac{27}{8}\)
\(=\frac{8}{6}-\frac{27}{8}\)
\(=\frac{32}{24}-\frac{81}{24}\)
\(=\frac{-49}{24}\)
Chúc bạn học tốt !!!
\(\left|-\frac{2}{5}x-\frac{4}{3}\right|=\left|4x-\frac{5}{6}\right|\)
\(=-\frac{2x}{5}-\frac{4}{3}=4x-\frac{5}{6}\)
\(=-\frac{2x}{5}-\frac{4}{3}=-\left(4x-\frac{5}{6}\right)\)
\(=x=-\frac{5}{44};\frac{65}{108}\)
\(\Rightarrow x=\orbr{\begin{cases}x=-\frac{5}{44}\\x=\frac{65}{108}\end{cases}}\)
|−25 x−43 |=|4x−56 |
=−2x5 −43 =4x−56
=−2x5 −43 =−(4x−56 )
=x=−544 ;65108
⇒x=[
| x=−544 |
| x=65108 |
Ta có \(\frac{-17}{30}-\frac{-11}{15}-\frac{7}{12}\)
\(=\frac{-17}{30}+\frac{11}{15}-\frac{7}{12}\)
\(=\left(\frac{-17}{30}+\frac{22}{30}\right)-\frac{7}{12}\)
\(=\frac{1}{6}-\frac{7}{12}=\frac{2}{12}-\frac{7}{12}=-\frac{5}{12}\)
a, <=> (3+7+...+97) - (1+5+...+99)
\(=\left(\frac{97-3}{4}+1\right)\left(\frac{97+3}{2}\right)-\left(\frac{99-1}{4}+1\right)\left(\frac{99+1}{2}\right)\)
1225 - 1275 = -50
b, Tương tự
\(-12(x-5)+7(3-x)=5\)
\(\Rightarrow-12x-60+21-7x=5\)
\(\Rightarrow-12x-7x-60+21=5\)
\(\Rightarrow-12x-7x-81=5\)
\(\Rightarrow-19x-81=5\)
\(\Rightarrow81-19x=5\)
\(\Rightarrow-19x=-76\)
\(\Rightarrow x=4\)
-12(x-5)+7(3-x)=5
-12x-(-12.5)+7.3-7x=5
-12x-(-60)+21-7x=5
-12x-(-60)+21=5+7x
-12x-(-60)=5+7x-21
-12x=5+7x-21+(-60)
-12x-7x=5-21+(-60)
-19x=-76
x=-76:(-19)
x=4
vậy x=4
0,03 : -5/7 - 6,87. 7/5 + 1,1 . ( -1,4 )
= -0,03 . 7/5 -6,87 . 7/5 + 1,1 . ( - 1,4 )
= -7/5 . ( -0,03 - 6,87 ) + 1,1 .( -1,4 )
= -1,4 . -6,9 + 1,1 . ( -1,4 )
= -1,4 . ( -6,9 + 1,1 )
= -1,4 . (-5,8 )
= 8,12
nhớ k và kết bạn vs mik nha