x +30%x=2627,3
giúp mình bài này ik
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\(5x^2-8xy-4y^2\)
\(=\left(5x^2-10xy\right)+\left(2xy-4y^2\right)\)
\(=5x\left(x-2y\right)+2y\left(x-2y\right)\)
\(=\left(5x+2y\right)\left(x-2y\right)\)
\(6,\\ a,\\ 1,A=x^2+3x+7=\left(x+\dfrac{3}{2}\right)^2+\dfrac{19}{4}\ge\dfrac{19}{4}\)
Dấu \("="\Leftrightarrow x=-\dfrac{3}{2}\)
\(2,B=\left(x-2\right)\left(x-5\right)\left(x^2-7x+10\right)=\left(x-2\right)^2\left(x-5\right)^2\ge0\)
Dấu \("="\Leftrightarrow\left[{}\begin{matrix}x=2\\x=5\end{matrix}\right.\)
\(b,\\ 1,A=11-10x-x^2=-\left(x+5\right)^2+36\le36\)
Dấu \("="\Leftrightarrow x=-5\)
có thể bn vt sai đề nhưng mk làm theo cái đề nha
\(\left(x+\frac{1}{2}\right)^2=\left(\sqrt{\frac{1}{6}}\right)^2=\left(-\sqrt{\frac{1}{6}}\right)^2\)
\(=>\orbr{\begin{cases}x=\sqrt{\frac{1}{6}}-\frac{1}{2}\\x=-\sqrt{\frac{1}{6}}-\frac{1}{2}\end{cases}}\)
Vậy .....
\(\left(\left(x+\frac{1}{2}\right)\cdot2\right)-\frac{1}{6}=0\)
\(\frac{x\cdot2+1}{2}=\frac{2x+1}{2}\)
\(\left(\frac{\left(x\cdot2+1\right)}{2}\cdot2\right)-\frac{1}{6}=0\)
\(\left(2x+1\right)-\frac{1}{6}=0\)
\(2x+1=\frac{2x+1}{1}=\frac{\left(2x+1\right)\cdot6}{6}\)
\(\frac{\left(2x+1\right)\cdot6-\left(1\right)}{6}=\frac{12x+5}{6}\)
\(\frac{12x+5}{6}\cdot6=0\cdot6\)
\(12x+5=0\)
\(x=\frac{-5}{12}=0.417\)
( x - 10 ) ( 2x - 30 ) = 0
\(\Rightarrow\hept{\begin{cases}x-10=0\\2x-30=0\end{cases}}\)
\(\Rightarrow\hept{\begin{cases}x=10\\2x=30\end{cases}}\)
\(\Rightarrow\hept{\begin{cases}x=10\\x=15\end{cases}}\)
Vậy,........
81 - ( x-5) = 103
81 - x + 5 = 103
86 - x = 103
x = 86 - 103
x = -17
Who are you often meet on Saturday?
Why your father usually have beefsteak for his breakfast?
How many big beds in your bedroom?
=> x+ 3/10=26273/10
=> x=26273/10-3/10
=>x=2627
mong là đúng!!
\(x+30\%x=2627.3\)
\(\Leftrightarrow130\%x=2627.3\)
\(\Leftrightarrow\dfrac{130}{100}\cdot x=2627.3\)
\(\Leftrightarrow x=2021\)