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1: \(\Leftrightarrow x^3-9x^2+27x-27=-35\)
\(\Leftrightarrow\left(x-3\right)^3=-35\)
\(\Leftrightarrow x-3=\sqrt[3]{-35}\)
hay \(x=\sqrt[3]{-35}+3\)
2: \(\Leftrightarrow8x^3-12x^2+6x-1-8x^3+12x^2=5\)
=>6x=6
hay x=1
4: \(\Leftrightarrow x^3+3x^2+3x+1-x^3+3x^2-3x+1-6x^2+12x-6=-10\)
=>12x-4=-10
=>12x=-6
hay x=-1/2
a) Ta có x^3 - 3x^2 +3x -1= (x-1)^3 ( Hăng đẳng thức (a-b)^3=a^3 - 3a^2b +3ab^2 - b^3)
Mà: x=101 nên (x-1)^3 = (101-1)^3 = 100^3= 1000000
b,c,d tương tự bạn tự lm nhé ^_^
tớ lm câu a thui nha , tại khó quá ^^
a/ \(=3x^6+3x^5+6x^4+3x^3+3x^2-7x^5-7x^4-14x^3-7x^2-7x+3x^4+3x^3+6x^2+3x+1\)
\(=3x^2\left(x^4+x^3+2x^2+x+1\right)-7x\left(x^4+x^3+2x^2+x+1\right)+3\left(x^4+x^3+2x^2+x+1\right)\)
\(=\left(3x^2-7x+3\right)\left(x^4+x^3+x^2+x^2+x+1\right)\)
\(=\left(3x^2-7x+3\right)\left[x^2\left(x^2+x+1\right)+\left(x^2+x+1\right)\right]\)
\(=\left(3x^2-7x+3\right)\left(x^2+1\right)\left(x^2+x+1\right)\)
a) \(20m^3n^2-15m^4n^2+25m^5n^2\\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ = 5m^3n^2\left(4-3m+5m^2\right)\\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \)
b) \(4x^2+6x-9\\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ =\left(2x-3\right)^2\)
c)\(2x^4-32\\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ =2\left(x^4-2^4\right)\\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ =2\left(x-2\right)\left(x^3-2^3\right)\\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ =2\left(x-2\right)\left(x-2\right)\left(x^2+2x+4\right)\)
d)\(8x^3+60x^2y+150xy^2+125y^3\\ \\ \\ \\ \\ \\ \\ \\ \\ \\ =\left(2x+5y\right)^3\)
a: \(20m^3n^2-15m^4n^2+25m^5n^2\)
\(=5m^3n^2\left(4-3m+5m^2\right)\)
c: \(2x^4-32\)
\(=2\left(x^4-16\right)\)
\(=2\left(x^2+4\right)\left(x^2-4\right)\)
\(=2\left(x^2+4\right)\left(x-2\right)\left(x+2\right)\)
Làm bài 1 thôi !! Mấy bài kia tương tự . Tìm nhân tử chung ra .
a) \(m^2-n^2=\left(m-n\right)\left(m+n\right)\)
b) \(\left(x^2+x-1\right)^2-\left(x^2+2x+3\right)^2=\left(x^2+x-1+x^2+2x+3\right)\left(x^2+x-1-x^2-2x-3\right)\)
\(=\left(2x^2+3x+2\right)\left(-x-4\right)\)
c) \(-16+\left(x-3\right)^2=\left(x-3+4\right)\left(x-3-4\right)=x\left(x-7\right)\)
d) \(64+16y+y^2=\left(y+8\right)\left(y+8\right)\)
\(9,=\left(5+2x\right)^3\\ 10,=\left(y+4\right)^3\\ 11,=\left(2x-y\right)\left(4x^2+2xy+y^2\right)\\ 12,=\left(x+5y\right)\left(x^2-5xy+25y^2\right)\)