36798 x 47890 - 2672 : 5=?
Giúp mk nhé!
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\(x:25\%+x:0,5+x\cdot5=270\)
\(x\cdot4+x\cdot2+x\cdot5=270\)
\(x\cdot\left(4+2+5\right)=270\)
\(x\cdot11=270\)
\(x=\dfrac{270}{11}\)
X : 25% + X : 0,5 + X x 5 - X = 270
X : \(\dfrac{1}{4}\) + X : \(\dfrac{1}{2}\) + X x 5 -X =270
X x 4 +X x 2 +X x 5 -X = 270
X x ( 4+ 2+ 5 -1 ) = 270
x x 10 = 270
X = 270 : 10
X = 27
\(\frac{1}{5}x+\frac{2}{5}x=x-4\)
\(\frac{3}{5}x=x-4\)
\(\frac{3}{5}x-x=-4\)
\(-\frac{2}{5}x=-4\)
\(x=10\)
\(\frac{1}{5}x+\frac{2}{5}x\)= x - 4
\(\frac{3}{5}x\)= x - 4
\(\frac{3}{5}x\)- x = - 4
\(\frac{-2}{5}x\)= -4
x = -4 : \(\frac{-2}{5}\)
x = 10
Ta thấy:
\(70-5\left(x-3\right)=40\)
\(\Rightarrow5\left(x-3\right)=70-40\)
\(\Rightarrow5\left(x-3\right)=30\)
\(\Rightarrow x-3=30\div5\)
\(\Rightarrow x-3=6\)
\(\Rightarrow x=6+3\)
\(\Rightarrow x=9\)
70 - 5 ( x - 3 ) = 40
5 ( x - 3 ) = 70 - 40
5 ( x - 3 ) = 30
x - 3 = 30 :5
x - 3 = 6
x = 6+ 3
x = 9
\(\frac{x}{3}=\frac{5}{8}+\frac{1}{8}\)
\(\frac{x}{3}=\frac{6}{8}=\frac{3}{4}\)
\(\Rightarrow x\cdot4=3^2\)\(x=\frac{9}{4}\)hay\(x=2.25\)
x/2-x/6-17/3=12-5
3x/6-x/6-17/3=7
2x/6-17/3=7
2x/6=7+17/3
2x/6=38/3
x/3=38/3
=>x=38
vậy x=38
2x là 2 nhân x nhe
k mk nha
a, x(x+3) = 0
\(\Rightarrow\orbr{\begin{cases}x=0\\x+3=0\end{cases}}\)\(\Rightarrow\orbr{\begin{cases}x=0\\x=-3\end{cases}}\)
Vậy \(x\in\left\{0;-3\right\}\)
b, (x-2)(5-x)=0
\(\Rightarrow\orbr{\begin{cases}x-2=0\\5-x=0\end{cases}}\)\(\Rightarrow\orbr{\begin{cases}x=2\\x=5\end{cases}}\)
Vậy \(x\in\left\{2;5\right\}\)
a) x(x+3)=0
*x=0
*x+3=0
x=0-3
x=-3
Vậy x=-3
b) (x-2)(5-x)=0
=> x-2=0 hoặc 5-x=0
=> x=2 hoặc x=5
Vậy x=2 hoặc x=5
\(\left(x-5\right)^{2016}=x-5\)
\(\Rightarrow\left(x-5\right)^{2016}-\left(x-5\right)=0\)
\(\Rightarrow\left(x-5\right)\left[\left(x-5\right)^{2015}-1\right]=0\)
\(\Rightarrow\orbr{\begin{cases}x-5=0\\\left(x-5\right)^{2015}-1=0\end{cases}}\)
\(\Rightarrow\orbr{\begin{cases}x=5\\\left(x-5\right)^{2015}=1\end{cases}}\)
\(\Rightarrow\orbr{\begin{cases}x=5\\x-5=1\end{cases}}\)
\(\Rightarrow\orbr{\begin{cases}x=5\\x=6\end{cases}}\)
\(Vậy\)\(x\in\left\{5;6\right\}\)
(x - 5)2016 = x - 5
=> (x - 5)2016 - (x - 5) = 0
=> (x - 5).[(x - 5)2015 - 1] = 0
=> \(\orbr{\begin{cases}x-5=0\\\left(x-5\right)^{2015}-1=0\end{cases}\Rightarrow\orbr{\begin{cases}x=5\\\left(x-5\right)^{2015}=1^{2015}\end{cases}\Rightarrow}\orbr{\begin{cases}x=5\\x-5=1\end{cases}\Rightarrow}\orbr{\begin{cases}x=5\\x=6\end{cases}}}\)
Vậy x = 5;x= 6
36798 x 47890 - 2672 : 5
= 1 762 256 220 - 534,4
= 1762255685,6
1762255685,6