標題:
F.210題數學題目
發問:
1. 圖片參考：http://imgcld.yimg.com/8/n/HA07803598/o/701108290097513873450650.jpg 2.x3-x2y+2x (多項式分解)3.(4m-n)(2m+n)+(7n-m)(2m+n) (多項式分解)4.已知2x2-5x+1=-1及xy2=3,求8x3y2-20x2y2+4xy2 的值。5.展開（x2+3x)2+3(x2+3x)+26.求多項式的L.C.M. x+y,x-y,(x+y)27. 1 - 1 ab ac (化簡)8. x3 × -7 ÷ x2 7-7x x x-1 ... 顯示更多 1. 圖片參考：http://imgcld.yimg.com/8/n/HA07803598/o/701108290097513873450650.jpg 2.x3-x2y+2x (多項式分解) 3.(4m-n)(2m+n)+(7n-m)(2m+n) (多項式分解) 4.已知2x2-5x+1=-1及xy2=3,求8x3y2-20x2y2+4xy2 的值。 5.展開（x2+3x)2+3(x2+3x)+2 6.求多項式的L.C.M. x+y,x-y,(x+y)2 7. 1 - 1 ab ac (化簡) 8. x3 × -7 ÷ x2 7-7x x x-1 (化簡） 9. p=x - y [x] 公式 a6 10. d=(3a+b)2-(3a-b)2 [b] —————————————— 要步驟
此文章來自奇摩知識+如有不便請留言告知
最佳解答:
1. Angle BAC = 180-144 = 36 Angle ABC = Angle ACB = a So, Angle BAC + ABC + ACB = 180 36 + a + a = 180 2a + 36 = 180 2a = 144 a = 72 2. x3-x2y+2x = x(x^2-xy+2) 3.(4m-n)(2m+n)+(7n-m)(2m+n) = (8m^2+2mn-n^2)+(-2m^2+13mn+7n^2) = 6m^2+15mn+6n^2 = 3(2m^2+5mn+2n^2) = 3(2m+n)(m+2n) 4. 已知2x2-5x+1=-1 xy2=3 8x3y2-20x2y2+4xy2 = 4xy^2(2x^2-5x+1) = 4(3)(-1) = -12 5. （x2+3x)2+3(x2+3x)+2 = (x^4+6x^3+9x^2)+(9x^2+9x)+2 = x^4+6x^3+18x^2+9x+2 6. L.C.M. of x+y,x-y,(x+y)2 = (x-y) (x+y)^2 7. 1/ab - 1/ac = (c-b)/abc 8. x^3/(7-7x) * -7/x / x^2/(x-1) = x^2/(x-1) * (x-1)/x^2 = 1 9. p= x/a - y/6 x/a = p + y/6 x = a(p + y/6) 10. d=(3a+b)2-(3a-b)2 d = [(3a+b)+(3a-b)][(3a+b)-(3a-b)] = 6a * 2b = 12ab b = d/12a
其他解答:4E350C6F8B48ECA2
留言列表
