1. Tìm x ∈ N sao cho:
a) (x - 140) : 7 = 33 - 23 . 3
b) x3 . x2 = 28 : 23
c) (x + 2) . (x - 4) = 0
d) 3x-3 - 32 = 2 . 32
2. Tìm x ∈ N sao cho:
a) 9 : (x + 2)
b) (x + 17) : (x + 3)
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Những câu hỏi liên quan
30 tháng 11 2021 lúc 20:08
1. Tìm x N sao cho:a) (x - 140) : 7 - . 3b) . : c) (x + 2) . (x - 4) 0d) - 2 . 2. Tìm x N sao cho:a) 9 : (x + 2)b) (x + 17) : (x + 3)Giúp mình với, mình cân gấp!
Đọc tiếp
1. Tìm x format('truetype')%3Bfont-weight%3Anormal%3Bfont-style%3Anormal%3B%7D%3C%2Fstyle%3E%3C%2Fdefs%3E%3Ctext%20font-family%3D%22math15c341d10c5596a0fd920fda9f3%22%20font-size%3D%2216%22%20text-anchor%3D%22middle%22%20x%3D%228.5%22%20y%3D%2216%22%3E%26%23x2208%3B%3C%2Ftext%3E%3C%2Fsvg%3E)
N sao cho:
a) (x - 140) : 7 = 
- 
. 3
b) 
. 
= 
:
c) (x + 2) . (x - 4) = 0
d) format('truetype')%3Bfont-weight%3Anormal%3Bfont-style%3Anormal%3B%7D%3C%2Fstyle%3E%3C%2Fdefs%3E%3Ctext%20font-family%3D%22Arial%22%20font-size%3D%2216%22%20text-anchor%3D%22middle%22%20x%3D%224.5%22%20y%3D%2219%22%3E3%3C%2Ftext%3E%3Ctext%20font-family%3D%22Arial%22%20font-size%3D%2212%22%20font-style%3D%22italic%22%20text-anchor%3D%22middle%22%20x%3D%2212.5%22%20y%3D%2212%22%3Ex%3C%2Ftext%3E%3Ctext%20font-family%3D%22math1da40657c9fece7e48d30af42d3%22%20font-size%3D%2212%22%20text-anchor%3D%22middle%22%20x%3D%2222.5%22%20y%3D%2212%22%3E%26%23x2212%3B%3C%2Ftext%3E%3Ctext%20font-family%3D%22Arial%22%20font-size%3D%2212%22%20text-anchor%3D%22middle%22%20x%3D%2231.5%22%20y%3D%2212%22%3E3%3C%2Ftext%3E%3C%2Fsvg%3E)
- 
= 2 .
2. Tìm x N sao cho:
a) 9 : (x + 2)
b) (x + 17) : (x + 3)
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Câu 2:
a: \(\Leftrightarrow x+2\in\left\{3;9\right\}\)
hay \(x\in\left\{1;7\right\}\)
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Tìm x ∈ Z sao cho:
a. (3x + 4) ⋮ (x – 3) (x ≠ 3)
b. (x2 + 3x – 13) ⋮ (x + 3) (x ≠ -3)
c. (x2 + 3) ⋮ (x -1) (x ≠ 1)
d. (x2 + 2x – 11) ⋮ (x + 2) (x ≠ -2)
help me plz
Bài 5.Tìm x N, sao cho:a)3636 : (12x –91) 36b)(x : 23 + 45) . 67 8911c)[(6x –39) : 7]. 4 12d)(3x –24). 73 2. 74e)x(x –10) 0f)(x+ 1). (x –2) 0g)(9 –x)3 64h)3x 81i)2 . 3x 10 . 312+ 8 . 312j)(19x + 2.52) : 14 (13 -8)2-42
Đọc tiếp
Bài 5.Tìm x N, sao cho:
a)3636 : (12x –91) = 36
b)(x : 23 + 45) . 67 = 8911
c)[(6x –39) : 7]. 4 = 12
d)(3x –24). 73= 2. 74
e)x(x –10) = 0
f)(x+ 1). (x –2) = 0
g)(9 –x)3= 64
h)3x= 81
i)2 . 3x= 10 . 312+ 8 . 312
j)(19x + 2.52) : 14 = (13 -8)2-42
\(a,\Rightarrow12x-91=101\\ \Rightarrow12x=192\\ \Rightarrow x=16\\ b,\Rightarrow x:23+45=133\\ \Rightarrow x:23=88\\ \Rightarrow x=\dfrac{88}{23}\\ c,\Rightarrow\left(6x-39\right):7=3\\ \Rightarrow6x-39=21\\ \Rightarrow6x=60\\ \Rightarrow x=10\\ d,\Rightarrow3x-24=\dfrac{148}{73}\\ \Rightarrow3x=\dfrac{1900}{73}\\ \Rightarrow x=\dfrac{1900}{219}\\ e,\Rightarrow\left[{}\begin{matrix}x=0\\x=10\end{matrix}\right.\\ f,\Rightarrow\left[{}\begin{matrix}x=-1\\x=2\end{matrix}\right.\\ d,\left(9-x\right)^3=64=4^3\\ \Rightarrow9-x=4\\ \Rightarrow x=5\\ h,\Rightarrow x=27\\ i,\Rightarrow6x=312\cdot12=624\cdot6\\ \Rightarrow x=624\\ j,\Rightarrow\left(19x+104\right):14=25-42=-17\\ \Rightarrow19x+104=-238\\ \Rightarrow19x=-342\\ \Rightarrow x=-18\)
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Bài 6. Tìm x Z, sao cho:
a. (x – 3) – 12 = – 25
f. 121 – (35 – x) = 2.52
c. 72 – (84 – 9x) : 7 = 69
g. 2(17 + x) – (400 – 325) = – 31
d. (x + 7).(x – 5) =0
h. (x – 10).(x2 – 9) = 0
e. (x + 8).(x2 + 1) = 0
i. 17 – { – x + [– x – (– x)]} = – 16
a: \(\Leftrightarrow x-3=-13\)
hay x=-10
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Tìm x ∈ N sao cho:
a)x ⋮ 15;x ⋮ 20 và 50
b)30⋮ x;45⋮x và x>10
c)9:(x+2)
d)(x+17):(x+3)
b: 30 chia hết cho x
45 chia hết cho x
Do đó: \(x\inƯC\left(30;45\right)=Ư\left(15\right)\)
mà x>10
nen x=15
c: \(\Leftrightarrow x+2\in\left\{1;-1;3;-3;9;-9\right\}\)
hay \(x\in\left\{-1;-3;1;-5;7;-11\right\}\)
d: =>x+3+14 chia hết cho x+3
=>\(x+3\in\left\{1;-1;2;-2;7;-7;14;-14\right\}\)
hay \(x\in\left\{-2;-4;-1;-5;4;-10;11;-17\right\}\)
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tìm x, biết:
a) 9x2+36=0
b) 3(x+4)-x2-4x=0
c) x(2x-1)-(x-2)(2x+1)=0
d) (2x-3)2-4x2=00
e)1 phần 3.x2-3x=0
f) x3-x2-x+1=0
ráng giúp mình nha
\(a,\Leftrightarrow9x^2=-36\Leftrightarrow x\in\varnothing\\ b,\Leftrightarrow3\left(x+4\right)-x\left(x+4\right)=0\\ \Leftrightarrow\left(3-x\right)\left(x+4\right)=0\\ \Leftrightarrow\left[{}\begin{matrix}x=3\\x=-4\end{matrix}\right.\\ c,\Leftrightarrow2x^2-x-2x^2+3x+2=0\\ \Leftrightarrow2x=-2\Leftrightarrow x=-1\\ d,\Leftrightarrow\left(2x-3-2x\right)\left(2x-3+2x\right)=0\\ \Leftrightarrow-3\left(4x-3\right)=0\\ \Leftrightarrow x=\dfrac{3}{4}\\ e,\Leftrightarrow\dfrac{1}{3}x\left(x-9\right)=0\Leftrightarrow\left[{}\begin{matrix}x=0\\x=9\end{matrix}\right.\\ f,\Leftrightarrow x^2\left(x-1\right)-\left(x-1\right)=0\\ \Leftrightarrow\left(x^2-1\right)\left(x-1\right)=0\\ \Leftrightarrow\left(x-1\right)^2\left(x+1\right)=0\\ \Leftrightarrow\left[{}\begin{matrix}x=1\\x=-1\end{matrix}\right.\)
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Tính nhanh :
a)(2x - 16)7 = 128
b) x3 . x2 = 28 : 23
c) 3 x - 3 - 32 = 2 . 32
MỌI NGƯỜI GIẢI GIÚP MÌNH NHÉ ! CẢM ƠN MỌI NGƯỜI !
\(a,\left(2x-16\right)^7=128\\ \Rightarrow\left(2x-16\right)^7=2^7\\ \Rightarrow2x-16=2\\ \Rightarrow2x=18\\ \Rightarrow x=9\\ b,x^3.x^2=2^8:2^3\\ \Rightarrow x^5=2^5\\ \Rightarrow x=5\\ c,3^{x-3}-3^2=2.3^2\\ \Rightarrow3^{x-3}-9=18\\ \Rightarrow3^{x-3}=27\\ \Rightarrow3^{x-3}=3^3\\ \Rightarrow x-3=3\\ \Rightarrow x=6\)
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1. Cho f(x)= x3 - 2x2 + 3x + 1; g(x)+ x3 + x - 1; h(x)= 2x2 -1
a) Tính f(x) - g(x) + h(x)
b) Tìm x sao cho f(x) - g(x) + h(x) = 0
2. Tìm nghiệm của
a) 5x + 3 (3x + 7) - 35
b) x2 + 8x - (x2 + 7x + 8) - 9
3. Tìm f(x) = x3 + 4x2 - 3x + 2; g(x) = x2 (x+4) + x - 5
Tìm x sao cho f(x) = g(x)
4. Tìm m sao cho k(x)= mx2 - 2x + 4 có nghiệm là -2
Cho đa thức: P(x) = \(x^4-3x^2+\dfrac{1}{2}-x\).
Tìm các đa thức Q(x), R(x), sao cho:
a, P(x) +Q(x) = \(x^5-2x^2+1\)
b, P(x) - R(x) = \(x^3\)
a)\(Q\left(x\right)=x^5+x^4-x^2-\dfrac{1}{2}-x\)
b)\(R\left(x\right)=x^4+x^3-3x^2+\dfrac{1}{2}-x\)
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