chia đơn thức
a) x3 : x2
b) 15x7 :3x2
c) 20x5 : 12x ?2
d) Tinh 15x2y2 : 5xy2
e) Tính 12x3 y : 9x2
giúp mik vs
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a) \(=\left(x-2\right)^2\)
b) \(=\left(2x+1\right)^2\)
c) \(=\left(4x-3y\right)\left(4x+3y\right)\)
d) \(=\left(4-x-3\right)\left(4+x+3\right)=\left(1-x\right)\left(x+7\right)\)
e) \(=\left(2x-3x+1\right)\left(2x+3x-1\right)=\left(1-x\right)\left(5x-1\right)\)
f) \(=\left(x-y\right)\left(x^2+xy+y^2\right)\)
g) \(=\left(x+3\right)\left(x^2-3x+9\right)\)
h) \(=\left(x+2\right)^3\)
i) \(=\left(1-x\right)^3\)
a: \(x^2-4x+4=\left(x-2\right)^2\)
b: \(4x^2+4x+1=\left(2x+1\right)^2\)
g: \(x^3+27=\left(x+3\right)\left(x^2-3x+9\right)\)
a) `3x+5 =0`
`3x=-5`
`x=-5/3`
`b) -4x+8=0`
`-4x =-8`
`x=2`
`c) 3x -6=0`
`3x=6`
`x=2`
`d)x^2 +x =0`
`x(x+1) =0`
`=>[(x=0),(x=-1):}`
`e) x^2 -4 =0`
`x^2 =4`
`=> x = +-2`
`f) x^3 -27 =0`
`x^3 =27`
`=> x=3`
`g) 3x^2 +4 =0`
`3x^2 =-4`
`x^2 =-4/3(vô-lí)`
=> Đa thức ko có nghiệm
h) `x^3 -4x =0`
`x(x^2 -4) =0`
`=>[(x=0),(x^2=4 => x=+-2):}`
i) `2x^3 -32x =0`
`2x(x^2 -16)=0`
`=>[(2x=0),(x^2=16):}`
`=>[(x=0),(x=+-4):}`
\(a,=\left(x-1\right)^3\\ b,=\left(1-2x\right)\left(1+2x\right)\\ c,=x^3-8\\ d,=\left(3x-1\right)\left(9x^2+3x+1\right)\\ e,=\left(x+2\right)\left(x^2-2x+4\right)\\ g,=\left(x-2\right)^2\\ h,=x^2-4y^2\\ j,=\left(x-4\right)^2\)
a: \(C=x^3-3x^2+3x+2023\)
\(C=x^3-3x^2+3x-1+2024\)
\(=\left(x-1\right)^3+2024\)
Khi x=101 thì \(C=\left(101-1\right)^3+2024\)
\(=100^3+2024\)
\(=1000000+2024=1002024\)
b: \(D=x^3-6x^2+12x-100\)
\(=x^3-6x^2+12x-8-92\)
\(=\left(x-2\right)^3-92\)
Khi x=-98 thì \(D=\left(-98-2\right)^3-92\)
\(=-100^3-92\)
\(=-1000000-92=-1000092\)