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發問:
1a.Factorize k^3+64 1b.Hence,Factorize k^3+k+68 2a.Factorize 2h^3+54 2b Hence,Factorize 2h^3-6h^2-18h+54 3.9^x/2 + 3^x+1 / 3^x-3^x-1 4.Factorize X^2+6X AND X^2-36
最佳解答:
1a. (k+4)(k^2-4k+16) 1b. k^3+k+68 =K^3+64+4+k =(k+4)(k^2-4k+16)+4+k =(k+4)(k^2-4k+17) 2a. 2h^3+54 =2(h^3+27) =2(h+3)(h^2-3h+9) 2b 2h^3-6h^2-18h+54 =2(h+3)(h^2-3h+9)-6h(h+3) =(h+3)(2h^2-6h+18-6h) =(h+3)(2h^2-12h+18) 2010-02-20 15:01:14 補充： 4. X^2+6X =x(x+6) X^2-36 =(x+6)(x-6)
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MATHS ........THX!!!發問:
1a.Factorize k^3+64 1b.Hence,Factorize k^3+k+68 2a.Factorize 2h^3+54 2b Hence,Factorize 2h^3-6h^2-18h+54 3.9^x/2 + 3^x+1 / 3^x-3^x-1 4.Factorize X^2+6X AND X^2-36
最佳解答:
1a. (k+4)(k^2-4k+16) 1b. k^3+k+68 =K^3+64+4+k =(k+4)(k^2-4k+16)+4+k =(k+4)(k^2-4k+17) 2a. 2h^3+54 =2(h^3+27) =2(h+3)(h^2-3h+9) 2b 2h^3-6h^2-18h+54 =2(h+3)(h^2-3h+9)-6h(h+3) =(h+3)(2h^2-6h+18-6h) =(h+3)(2h^2-12h+18) 2010-02-20 15:01:14 補充： 4. X^2+6X =x(x+6) X^2-36 =(x+6)(x-6)
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