數學因式分解問題
2017/06/12 22:25
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標題:
數學因式分解問題
發問:
16+2(a+b)^3 (a+b)^3(a-b)^3 更新: 希望詳細解釋
最佳解答:
16+2(a+b)^3 = 2(2)^3 + 2(a+b)^3 = 2[(2)^3 + (a+b)^3] = 2[(2+(a+b))(2^2 –(2)(a+b) +(a+b)^2)] = 2[(2+a+b)(4 -2a -2b +(a+b)^2)] = 2(2+a+b)(4 -2a -2b +a^2+2ab +b^2) = 2(2+a+b)( a^2 - 2a + b^2 - 2b + 2ab + 4) (a+b)^3(a-b)^3 = [(a+b)(a-b)]^3 = (a^2 – b^2)^3 2012-10-04 01:38:02 補充: Use these: Factorize the sum of cubes x^3 + y^3 = (x+y) (x^2 - xy + y^2) Factorize difference of squares: x^2 - y^2 = (x+y)(x-y) (x^3)(y^3) = (xy)^3 Example: (4^3)(5^3) = 20^3 (64)(125) = 8000 8000 = 8000 2012-10-05 23:59:58 補充: I am afraid that the answer for question (1) given by 回答者:002 is wrong 16+2(a+b)^3 = 2(a+b+8)^3 ( ~ wrong) Let us say a = 0, b = 0 16+2(a+b)^3 = 16 + 2(0+0)^3 = 16 2(a+b+8)^3 = 2(0 + 0 +8)^3 = 1024 16 is not equal to 1024
其他解答:
數學因式分解問題
發問:
16+2(a+b)^3 (a+b)^3(a-b)^3 更新: 希望詳細解釋
最佳解答:
16+2(a+b)^3 = 2(2)^3 + 2(a+b)^3 = 2[(2)^3 + (a+b)^3] = 2[(2+(a+b))(2^2 –(2)(a+b) +(a+b)^2)] = 2[(2+a+b)(4 -2a -2b +(a+b)^2)] = 2(2+a+b)(4 -2a -2b +a^2+2ab +b^2) = 2(2+a+b)( a^2 - 2a + b^2 - 2b + 2ab + 4) (a+b)^3(a-b)^3 = [(a+b)(a-b)]^3 = (a^2 – b^2)^3 2012-10-04 01:38:02 補充: Use these: Factorize the sum of cubes x^3 + y^3 = (x+y) (x^2 - xy + y^2) Factorize difference of squares: x^2 - y^2 = (x+y)(x-y) (x^3)(y^3) = (xy)^3 Example: (4^3)(5^3) = 20^3 (64)(125) = 8000 8000 = 8000 2012-10-05 23:59:58 補充: I am afraid that the answer for question (1) given by 回答者:002 is wrong 16+2(a+b)^3 = 2(a+b+8)^3 ( ~ wrong) Let us say a = 0, b = 0 16+2(a+b)^3 = 16 + 2(0+0)^3 = 16 2(a+b+8)^3 = 2(0 + 0 +8)^3 = 1024 16 is not equal to 1024
其他解答:
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16+2(a+b)^3 =2[8+(a+b)^3] =2(a+b+8)[64+8(a+b)+(a+b)^2] =2(a+b+8)[(a+b)+8)^2 =2(a+b+8)(a+b+8)^2 =2(a+b+8)^3 (a+b)^3(a-b)^3 =[(a+b)(a-b)]^3你可能會有興趣的文章:
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