(1)12x+6+13−x+x2(x2−9);
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![]() (1)原式=
1 2(x+3)- 1 x−3+ x 2(x+3)(x−3) = x−3−2(x+3)+x 2(x+3)(x−3) =- 9 2(x+3)(x−3); (2)原式=[ a+2 a(a−2)- 8 (a+2)(a−2)]• a a−2 = (a+2)2−8a a(a+2)(a−2)• a a−2 = (a−2)2 a(a+2)(a−2)• a a−2 = 1 a+2; (3)552×3-452×3 =3×(552-452) =3×(55+45)×(55-45) =3×100×10 =3000; (4)662+652-130×66 =662+652-2×65×66 =(66-65)2 =12 =1.
(1)12x+6+13−x+x2(x2−9);
计算:(1)x2+9xx2+3x+x2−9x2+6x+9
若−12≤x≤1,则式子x2−2x+1+x2−6x+9+4x2+4x+1等于( )
解方程:1/x2+x +1/x2+3x+2 +1/x2+5x+6 +1/x2+7x+12 +1/x2+9x+20=5/x
(x2+3x+9)/(x2-27)+(6x)/(9x-x2)-(x-1)/(6+2x)
(x/x2-9)-(1/x2+6x+9)计算
化简:根号(x2+6x+9)+根号(x2-2x+1)-根号(x2-4x+4)
先化解,再求值:【1/(x2+3x+2)+1/(x2+5x+6)+1/(x2+7x+12)】/1/(x2+9x+20),
先化简,再求值:x(x2-6x-9)-x(x2-8x-15)+2x(3-x),其中x=−16
解方程7/(x+x2)-3/(x-x2)=6/(x2-1)
(x-2)(x2-6x-9)-x(x2-2x-15),其中x=13
x2+3x+9/x2-27+6x/9x-x2-x-1/6+2x 化简
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