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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: \(2x^4-32\)
\(=2\left(x^4-16\right)\)
\(=2\left(x^2+4\right)\left(x^2-4\right)\)
\(=2\left(x^2+4\right)\left(x-2\right)\left(x+2\right)\)
\(8x^3+60x^2y+150xy^2+125y^3\)
\(=\left(8x^3+125y^3\right)+\left(60x^2y+150xy^2\right)\)
\(=\left(2x+5y\right)\left(4x^2-10xy+25y^2\right)+30xy\left(2x+5y\right)\)
\(=\left(2x+5y\right)\left(4x^2-10xy+25y^2+30xy\right)\)
\(=\left(2x+5y\right)\left(4x^2+20xy+25y^2\right)\)
\(=\left(2x+5y\right)\left(2x+5y\right)^2=\left(2x+5y\right)^3\)
C2 : Áp dụng luôn HĐT ( x + y ) 3
\(8x^3+60x^2y+150xy^2+125y^3\)
\(=\left(2x\right)^3+3.\left(2x\right)^2.5y+3.2x.\left(5y\right)^2+\left(5y\right)^3\)
\(=\left(2x+5y\right)^2\)
=.= hok tốt!!
a) = (3x)^2 + 2.3x.5+ 5^2 = (3x+5)^2
b) = (2/3x)^2-(4y)^2=(2/3x-4y)(2/3x+4y)
c) = -(9x^4-12/5x^2y^2+4/25y^4) = -[(3x^2)^2 - 2.3x^2.2/5y^2 + (2/5y^2)^2]= -(3x^2-2/5y^2)^2
d) = (x-5)^2 - 4^2= (x-5+4)(x-5-4) = (x-1)(x-9)
e) = (2x)^3 + 3.(2x)^2.(5y) + 3.(2x).(5y)^2 + (5y)^3 = (2x+5y)^3
f) = (8x)^2 - (8a+b)^2 = (8x-8a-b)(8x+8a+b)
g) = (7x-4-2x-1)(7x-4+2x+1) = (5x-5)(9x-3) = 5(x-1).3(x-3)=15(x-1)(x-3)
h) = (x-y)(x+y)- 2(x+y) = (x+y)(x-y-2)
# Chúc bạn học tốt #
2/ (b4 - 4b2 + 4) - 9a2 = (b2 - 2)2 - 9a2 = (b2 - 2 + 3a)(b2 - 2 - 3a)
a: \(20m^3n^2-15m^4n^2+25m^5n^2\)
\(=5m^3n^2\left(4-3m+5m^2\right)\)
c: \(2x^4-32\)
\(=2\left(x^4-16\right)\)
\(=2\left(x^2+4\right)\left(x^2-4\right)\)
\(=2\left(x^2+4\right)\left(x-2\right)\left(x+2\right)\)