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標題:
12題因式分解
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發問:
因式分解 1. (x+y)^ - 49 2. 81-(x-y)^ 3. (x-y)^-y^ 4. (2x-y)^ -x^ 5. (a-b)^-(a+b)^ 6. (2a+b)^ - (a-b)^ 7. 4(2x+y)^+4(2x+y)+1 8.(x-y)^ - 8(x-y)+16 9. (x^-y^)+4x+4y 10. (4x^-y^)-8x-4y 11.4x^-(4y^-4yz+z^) 12. (x^+6xy+9y^)-16z^
最佳解答:
^係2次方呀可? 1)(x+y)^ - 49 =(x+y)^ - 7^ =(x+y+7)(x+y-7) 2)81 - (x-y)^ =9^ - (x-y)^ =[9 -(x-y)][9+(x+y)] =(9 - x+y)(9+x+y) 3)(x-y)^ - y^ =( x - y+y)(x - y - y) =x(x - 2y) 4)(2x - y)^ - x^ =(2x - y+x)(2x - y -x) =(3X - y)(x - y) 5)(a - b)^ - (a+b)^ =[a - b+(a+b)][a -b-(a + b)] =(a - b+a+b)(a - b - a - b) =2a(-2b) = - 4ab 6)(2a+b)^ - (a - b)^ =[2a+b+(a - b)][2a+b - (a - b)] =3a(a+2b) 7)4(2x+y)^+4(2x+y)+1 =[2(2x+y)+1]^
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