標題:
F4 Rational functions
發問:
1) find the H.C.F. and L.C.M. of xyz^3 , x^2yz and y^2z .2) find the H.C.F. of (x+1)(x-2)(x-3)^2 and (x+1)^2(x-2)(x-3).3a) Factorize 2x^2-5x-3, 6x^2+x-1 and -2x^2+3x+2.b) Hence, find the H.C.F. of the three polynomials in (a)4a) Factorize 4x^3-x and 4x^2-4x+1.b) Hence, find the H.C.F. of 4x^3-x and... 顯示更多 1) find the H.C.F. and L.C.M. of xyz^3 , x^2yz and y^2z . 2) find the H.C.F. of (x+1)(x-2)(x-3)^2 and (x+1)^2(x-2)(x-3). 3a) Factorize 2x^2-5x-3, 6x^2+x-1 and -2x^2+3x+2. b) Hence, find the H.C.F. of the three polynomials in (a) 4a) Factorize 4x^3-x and 4x^2-4x+1. b) Hence, find the H.C.F. of 4x^3-x and 4x^2-4x+1. 5) find L.C.M. of (x-1)(x+2)(x+3)^2 and (x-1)^2(x+2)(x+3)
最佳解答:
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1) find the H.C.F. and L.C.M. of xyz^3 ,x^2yz and y^2z Sol yz|xyz3,x2yz,y2z ────────────── xz2,x2,y H.C.F=yz yz|xyz3,x2yz,y2z ────────────── x|xz2,x2,y ────────────── z2,x,yL.C.M=(yz)*x*z^2*x*y=x^2y^2z^3 2) find the H.C.F. of (x+1)(x-2)(x-3)^2 and(x+1)^2(x-2)(x-3) Sol x+1|(x+1)(x-2)(x-3)2,(x+1)2(x-2)(x-3) ─────────────────────────────── x-2|(x-2)(x-3)2,(x+1)(x-2)(x-3) ─────────────────────────────── x-3|(x-3)2,(x+1)(x-3) ─────────────────────────────── (x-3),(x+1) H.C.F=(x+1)(x-2)(x-3) 3a) Factorize 2x^2-5x-3,6x^2+x-1 and -2x^2+3x+2 Sol 2x^2-5x-3=(2x+1)(x-3) 6x^2+x-1=(3x-1)(2x+1) -2x^2+3x+2=(2x+1)(-x+2) b) Hence, find the H.C.F. of the three polynomials in (a) H.C.F=2x+1 4a) Factorize 4x^3-x and 4x^2-4x+1 4x^3-x=x(4x^2-1)=x(2x-1)(2x+1) 4x^2-4x+1=(2x-1)^2 b) Hence, find the H.C.F. of 4x^3-x and 4x^2-4x+1 H.C.F=2x-1 5) find L.C.M. of (x-1)(x+2)(x+3)^2 and (x-1)^2(x+2)(x+3) x-1|(x-1)(x+2)(x+3)2,(x-1)2(x+2)(x+3) ─────────────────────────────── x+2|(x+2)(x+3)2,(x-1)(x+2)(x+3) ─────────────────────────────── x+3|(x+3)2,(x-1)(x+3) ─────────────────────────────── (x+3),(x-1) L.C.M=(x-1)^2(x+2)(x+3)^2
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