Tim X
a. 22/5:X=44/5:5/2
b. 8,35xX+6,65xX=45
Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{22}{5}:x=\frac{44}{5}:\frac{5}{2}\)
\(\frac{22}{5}:x=\frac{44}{5}x\frac{2}{5}\)
\(\frac{22}{5}:x=\frac{88}{25}\)
\(x=\frac{22}{5}:\frac{88}{25}\)
\(x=\frac{22}{5}x\frac{25}{88}\)
\(x=\frac{5}{4}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
Bài 5:
a: x(x-4)=0
=>\(\left[{}\begin{matrix}x=0\\x-4=0\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=0\\x=4\end{matrix}\right.\)
b: Đề thiếu vế phải rồi bạn
Bài 6:
a: \(\left(-5\right)\cdot\left(-6\right)\cdot\left(-4\right)\cdot2\)
\(=-\left(2\cdot5\right)\cdot\left(4\cdot6\right)\)
\(=-24\cdot10=-240\)
b: \(\left(-3\right)\cdot2\cdot\left(-8\right)\cdot5\)
\(=3\cdot2\cdot8\cdot5\)
\(=\left(3\cdot8\right)\cdot\left(2\cdot5\right)\)
\(=24\cdot10=240\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(a,x=\dfrac{1}{2}-\dfrac{2}{5}\)
\(x=\dfrac{1}{10}\)
\(b,x+\dfrac{3}{7}=\dfrac{7}{10}\)
\(x=\dfrac{7}{10}-\dfrac{3}{7}\)
\(x=\dfrac{19}{70}\)
\(c,19-x=\dfrac{17}{20}\)
\(x=19-\dfrac{17}{20}\)
\(x=\dfrac{363}{20}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
Bài 2:
Sau 2 giờ con ốc sên bò được:
1/5+1/6=11/30(cây cột)
Sau 2 giờ thì con ốc sên còn phải bò:
1-11/30=19/30(cây cột)
![](https://rs.olm.vn/images/avt/0.png?1311)
a)\(\frac{22}{5}:x=\frac{44}{5}:\frac{5}{2}=\frac{44}{5}.\frac{2}{5}=\frac{84}{25}\)
\(\Rightarrow x=\frac{22}{5}:\frac{84}{25}=\frac{22}{5}.\frac{25}{84}=\frac{55}{42}\)
b) \(8,35x+6,65x=45\)
\(\Rightarrow\left(8,35+6,65\right)x=45\Rightarrow15x=45\)
\(\Rightarrow x=45:15=3\)
\(a,\frac{22}{5}\div x=\frac{44}{5}\div\frac{5}{2}\)
\(\Rightarrow\frac{22}{5}\div x=\frac{88}{25}\)
\(\Rightarrow x=\frac{5}{4}\)
\(b,8,35\times x+6,65\times x=45\)
\(\Rightarrow x\times\left(8,35+6,65\right)=45\)
\(\Rightarrow x\times15=45\)
\(\Rightarrow x=3\)
~Study well~
#Thạc_Trân