Tim cac gia tri cua X de biet thuc sau nhan gia tri am
a)x^2+5x
b)3x(2x+3)x(4y-3)
Những câu hỏi liên quan
Tim cac gia tri cua Y de bieu thuc sau nhan gia tri duong
a)2y^2-4y
b)5x(3y+1)x(4y-3)
tim cac gia tri cua x de bieu thuc sau nhan gia tri am
a)x mu 2 + 5x b)x mu 2 - 5/2x c)3(2x+3)(3x-5) d)x - 2/x-6 e) x mu 2 -1/x mu 2
Bai 14 :Tim cac gia tri cua x de bieu thuc sau nhan gia tri duong:
a) 3x-2 b)x2-5x
\(3x-2>0\)
\(\Leftrightarrow3x>2\)
\(x>0\)
\(x^2-5x>0\)
\(x\left(x-5\right)>0\)
\(x>5\)
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tim cac gia tri cua x de bieu thuc sau nhan gia tri duong
a) x mu 2 + 4x b)2x mu 2 - 4x c)(x-3)(x+7) d)5(3x +1 )(4x-3) e)(1/2-x)(1/3-x)
Tim cac gia tri nguyen cua x de cac gia tri bieu thuc sau la so nguyen
a, 9-2x/x-3
b,3x-5/x-2
c,-3/4-x
tim cac gia tri nguyen cua x de bieu thuc sau nhan gia tri duong (x+1).(x-2)/x+6
\(\Rightarrow\)(x + 1) . (x - 2)\(⋮\)(x + 6)
\(\Rightarrow\)(x + 1) . (x -2)\(⋮\)x + 6
(x - 2) . (x+1) \(⋮\)x+ 6
(x - 2) . (x + 6 - 5)\(⋮\)x+ 6
x + 6 \(⋮\)x + 6
5\(⋮\)x + 6
( x -2 ) \(⋮\)6
6+x\(\in\)Ư (5) = ( 1 , 5) Vì biểu thức trên dương nên 6 + x cũng dương.
x + 6 = 1 x + 6 =5
x=-5 x=-1
Vậy x\(\in\)(-5, -1)
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tim cac gia tri nguyen cua x de cac gia tri bieu thuc sau la so nguyen
a,9-2x/x-3
b,3x-5/x-2
c,-3/4-x
tim gia tri cua x de cac bieu thuc sau thuc sau:
A=3x+15
B=2x^2-32 co gia tri bang 0
a) \(A=3x+15=0\)
\(\Rightarrow3\left(x+5\right)=0\)
\(\Rightarrow x+5=0\)
\(\Rightarrow x=-5\)
b) \(B=2x^2-32=0\)
\(\Rightarrow2\left(x^2-16\right)=0\)
\(\Rightarrow\left(x-4\right)\left(x+4\right)=0\)
\(\Rightarrow\left[{}\begin{matrix}x-4=0\Rightarrow x=4\\x+4=0\Rightarrow x=-4\end{matrix}\right.\)
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CMR :
1/1.2 + 1/3.4 + 1/5.6 +.........+ 1/49.50 = 1/26 + 1/27 +.......+ 1/49 + 1/50.
Tim cac gia tri cua x de cac bieu thuc sau day nhan gia tri am :
a) x2 + 5x = A.
b) 3.(2x + 3) . (3x - 5).
Ai biet thi chi giup minh hai bai toan tren nhe ! Xin cam on moi nguoi. (Cang nhan cang tot,hihi)