(9x-63).(27-3x)=0
KC
Những câu hỏi liên quan
Tìm x biết:
a) x3 - 7x2 - 9x + 63 = 0
b) x3 - 3x2 + 3x - 1 + 2.(x2 - x) = 0
TM
8 tháng 2 2022 lúc 20:33
cho biểu thức
P=(\(\dfrac{\text{x^3+3x}}{\text{x^3+3x^2+9x+27}}\)+\(\dfrac{\text{3}}{\text{x^2+9}}\)):(\(\dfrac{\text{1}}{\text{x-3}}\)-\(\dfrac{\text{6x}}{\text{x^3-3x^2+9x-27}}\))
rút gọn p
với x>0 thì P không nhận gt nào
Tìm cácgt của x để P nguyên
ĐKXĐ: \(x\ne\pm3\)
\(P=\left[\dfrac{x\left(x+3\right)}{x^2\left(x+3\right)+9\left(x+3\right)}+\dfrac{3}{x^2+9}\right]:\left[\dfrac{1}{x-3}-\dfrac{6x}{x^2\left(x-3\right)+9\left(x-3\right)}\right]\)
\(=\left[\dfrac{x\left(x+3\right)}{\left(x+3\right)\left(x^2+9\right)}+\dfrac{3}{x^2+9}\right]:\left[\dfrac{1}{x-3}-\dfrac{6x}{\left(x-3\right)\left(x^2+9\right)}\right]\)
\(=\dfrac{x+3}{x^2+9}:\dfrac{x^2+9-6x}{\left(x-3\right)\left(x^2+9\right)}=\dfrac{x+3}{x^2+9}.\dfrac{\left(x-3\right)\left(x^2+9\right)}{\left(x-3\right)^2}=\dfrac{x+3}{x-3}\)
Ý 2 mình k hiểu ý bạn lắm
\(P=\dfrac{x+3}{x-3}=\dfrac{x-3+6}{x-3}=1+\dfrac{6}{x-3}\in Z\)
\(\Leftrightarrow\left(x-3\right)\inƯ\left(6\right)=\left\{-6;-3;-2;-1;1;2;3;6\right\}\)
Kết hợp vs ĐKXĐ \(\Rightarrow x\in\left\{0;1;2;4;5;6;9\right\}\)
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Tìm x:
a) 64x5-4x3=0
b) x3-81x=0
c) x(5-3x)-5+3x=0
d) 4x3+12x2-9x-27=0
e) x4-6x2+7=0
Tìm x:
a) 64x5-4x3=0
b) x3-81x=0
c) x(5-3x)-5+3x=0
d) 4x3+12x2-9x-27=0
e) x4-6x2+7=0
Tìm x biết 1/x^2+3x + 1/(x^2+9x+18) +1/(x^2+15x+54) +1/3x+27 +1/673=0
Cho biểu thức \(P=\left(\frac{x^2+3x}{x^3+3x^2+9x+27}+\frac{3}{x^2+9}\right):\left(\frac{1}{x-3}-\frac{6x}{x^3-3x^2+9x-27}\right)\)
a) Rút gọn P
b) Với x> 0 thì P không nhận những giá trị nào
c) Tìm x nguyên để P nguyên
\(\left(\frac{x^2+3x}{x^3+3x^2+9x+27}+\frac{3}{x^2+9}\right):\left(\frac{1}{x-3}-\frac{6x}{x^3-3x^2+9x-27}\right)\)
\(=\left(\frac{x\left(x+3\right)}{\left(x+3\right)\left(x^2+9\right)}+\frac{3}{x^2+9}\right):\left(\frac{1}{x-3}-\frac{6x}{\left(x-3\right)\left(x^2+9\right)}\right)\)
\(=\left(\frac{x}{x^2+9}+\frac{3}{x^2+9}\right):\left(\frac{x^2+9-6x}{\left(x-3\right)\left(x^2+9\right)}\right)=\frac{x+3}{x^2+9}:\frac{x^2+9-6x}{\left(x-3\right)\left(x^2+9\right)}\)
\(=\frac{\left(x+3\right)\left(x-3\right)\left(x^2+9\right)}{\left(x^2+9\right)\left(x^2-6x+9\right)}=\frac{\left(x+3\right)\left(x-3\right)}{\left(x-3\right)\left(x-3\right)}=\frac{x+3}{x-3}\)
b) \(Voix>0\Rightarrow P\ne\varnothing\)(mk ko chac)
c) \(P\inℤ\Leftrightarrow x+3⋮x-3\Leftrightarrow x-3\in\left\{-1;-2;-3;-6;1;2;3;6\right\}\)
sau do tinh
cau nay la toan lp 8 nha
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LT
14 tháng 12 2023 lúc 19:41
Bài 1: Tính giá trị của biểu thức M=x3+9x^2y+27xy^2+27y^3+27 biết ràng 1/3x+y+1=0
\(\dfrac{1}{3}x+y+1=0\)
=>\(\dfrac{1}{3}x+y=-1\)
\(M=x^3+9x^2y+27xy^2+27y^3+27\)
\(=\left(x^3+9x^2y+27xy^2+27y^3\right)+27\)
\(=\left(x+3y\right)^3+27\)
\(=\left[3\left(x+\dfrac{1}{3}y\right)\right]^3+27\)
\(=27\left(x+\dfrac{1}{3}y\right)^3+27\)
\(=27\left(-1\right)^3+27=0\)
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Tại sao ra đc bước : x^4 -3x^3 + 3x^2 -9x =0 này => 3x^4 -9x^3 + 9x^2 -27x=0 ( chuyển vế) => 3( x^4 -3x^3+3x^2 - 9x=0 => x^4 -3x^3 + 3x^2 -9x =0
Xem chi tiết
Rút gon: \(\left(\frac{x^2+3x}{x^3+3x^2+9x+27}\right):\left(\frac{1}{x-3}-\frac{6x}{x^3-3x^2+9x-27}\right)\)
\(\left(\frac{x^2+3x}{x^3+3x^2+9x+27}\right)\): \(\left(\frac{1}{x-3}-\frac{6x}{x^3-3x^2+9x-27}\right)\)
=\(\left[\frac{x\left(x+3\right)}{x^2\left(x+3\right)+9\left(x+3\right)}\right]\):\(\left[\frac{1}{x-3}-\frac{6x}{x^2\left(x-3\right)+9\left(x-3\right)}\right]\)
=\(\left[\frac{x\left(x-3\right)}{\left(x^2+9\right)\left(x-3\right)}\right]\):\(\left[\frac{1}{x-3}-\frac{6x}{\left(x^2+9\right)\left(x-3\right)}\right]\)
=\(\frac{x}{x^2+9}\):\(\left[\frac{x^2+9}{\left(x-3\right)\left(x^2+9\right)}-\frac{6x}{\left(x-3\right)\left(x^2+9\right)}\right]\)
=\(\frac{x}{x^2+9}\):\(\frac{\left(x-3\right)^2}{\left(x-3\right)\left(x^2+9\right)}\)
=\(\frac{x}{x^2+9}\):\(\frac{x-3}{x^2+9}\)
=\(\frac{x}{x^2+9}\).\(\frac{x^2+9}{x-3}\)
=\(\frac{x}{x-3}\)
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