x X 98 + x : 0, 5=2017
Tính giá trị biểu thức:
A=3.(y-1)^2017+5/9(x+5)^98-2. Biết x,y thỏa
2(x+6)^2+(y-2)^4=0
X=-6 ; y=2
Có số rồi thì thế vào làm
1. Tìm x thuộc Z, biết
a)21-(x-3)<0
b)(-2).(7+x)<0
C)(x-1).(x+2)<0
2.Tính tổng
A=0-1+2-3+4-5+6-7+.........+2017-2018
B=1-3+5-7+9-11+....+2005-2007
C=1+2+3-4-5-6+7+8+9-10-11-12+.....+97+98+99-100-101-102
1.
a, => 21-x+3 < 0
=> 24-x < 0
=> x < 24
b, => 7+x > 0
=> x > -7
c, => x-1 < 0 ; x+2 > 0 ( vì x-1 < x+2 )
=> x < 1 ; x > -2
=> -2 < x < 1
Tk mk nha
xx98+x:0,5=2017
x*98+x/0,5=2017
x*98+x*2=2017
x*100=2017
x=20,17
Tìm x
X*98+x:0,5=2017
\(x\times98+x:0,5=2017\)
\(x\times98+x\times2=2017\)
\(x\times\left(98+2\right)=2017\)
\(x\times100=2017\)
\(x=2017:100\)
\(x=20,17\)
x nhân 98 cộng cho x chia 0.5 = 2017 ( tìm x)
\(x\times98+x:0,5=2017\)
\(x\times98+x\times2=2017\)
\(x\times\left(98+2\right)=2017\)
\(x\times100=2017\)
\(x=2017:100\)
\(x=20,17\)
\(x\times98+x\div0,5=2017\)
\(x\times98+x\times2=2017\)
\(x\times\left(98+2\right)=2017\)
\(x\times100=2017\)
\(x=2017\div100\)
\(x=20,17\)
x x 98 + x : 0,5 = 2017
x x 98 + x x 2 = 2017
x x ( 98 + 2 ) = 2017
x x 100 = 2017
x = 2017 : 100
x = 2017
cho x + y + z = 2017
x , y , z khác 0
1 / x + 1 /y + 1/z = 1 / 2017
tính S = ( x^5 - 2017^5 ) * ( y^7 - 2017^7 ) * ( z^9 - 2017^9 )
a, 5(x+3)-6x-2x^2=0
b, 6x(x^2-2)-(2-x^2)=0
c, 4x(x-2017)-x+2017=0
d, 12x=x^2+36
a) \(5\left(x+3\right)-6x-2x^2=0\) \(\Leftrightarrow5.\left(x+3\right)-2x.\left(x+3\right)=0\)
\(\Leftrightarrow\left(x+3\right)\left(5-2x\right)=0\Leftrightarrow\hept{\begin{cases}x+3=0\\5-2x=0\end{cases}\Leftrightarrow\hept{\begin{cases}x=-3\\2x=5\end{cases}\Leftrightarrow}\hept{\begin{cases}x=-3\\x=\frac{5}{2}\end{cases}}}\)
b) \(6x.\left(x^2-2\right)-\left(2-x^2\right)=0\) \(\Leftrightarrow6x.\left(x^2-2\right)+\left(x^2-2\right)=0\)
\(\Leftrightarrow\left(x^2-2\right)\left(6x+1\right)=0\Leftrightarrow\hept{\begin{cases}x^2-2=0\\6x+1=0\end{cases}\Leftrightarrow\hept{\begin{cases}x^2=2\\6x=-1\end{cases}\Leftrightarrow}\hept{\begin{cases}x=\sqrt{2}\\x=\frac{-1}{6}\end{cases}}}\)
c) \(4x.\left(x-2017\right)-x+2017=0\) \(\Leftrightarrow4x.\left(x-2017\right)-\left(x-2017\right)=0\)
\(\Leftrightarrow\left(x-2017\right).\left(4x-1\right)=0\) \(\Leftrightarrow\hept{\begin{cases}x-2017=0\\4x-1=0\end{cases}\Leftrightarrow\hept{\begin{cases}x=2017\\4x=1\end{cases}\Leftrightarrow}\hept{\begin{cases}x=2017\\x=\frac{1}{4}\end{cases}}}\)
d) \(12x=x^2+36\) \(\Leftrightarrow x^2-12x+36=0\) \(\Leftrightarrow\left(x-6\right)^2=0\) \(\Rightarrow x-6=0\) \(\Leftrightarrow x=6\)
Xx98+X:0,5=2017
Xx98+Xx2=2017
Xx(98+2)=2017
Xx100 =2017
X=2017:100
X=20,17
Phân tích X:0,5 xuống dưới lại Xx2 vậy
X : 0,5 = X : \(\frac{1}{2}\)= X x \(\frac{2}{1}\)= X x 2