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標題:

maths mc 問題

發問:

1. [(1/2)^888] (-2)^887 A.-2 B.-0.5 C.0 D.0.5 5.Which of the floowing must have x+y as a factor I. x^2 - y^2 II x^2 + y^2 III x(x+y)-x-y A. I B.II C.I ,III D.II ,III

最佳解答:

1. [(1/2)^888] (-2)^887 =(-1)^887*(1/2) =-0.5 B.-0.5 5. I. x^2 - y^2=(x+y)(x-y) II x^2 + y^2=(x+y)^2-2xy III x(x+y)-x-y=x(x+y)-(x+y)=(x-1)(x+y) C.I ,III

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其他解答:

1. [(1/2)^888] (-2)^887 =-0.5 5. I. x^2 - y^2=(x+y)(x-y) II x^2 + y^2=(x+y)^2-2xy III x(x+y)-x-y=(x-1)(x+y) 2008-05-06 16:09:43 補充： 1) B 5) C|||||1.1/2^888=2^(-888). The product of 1. =(-2)^(-888+887)=(-2)^(-1)=-0.5=B 5. I.=(x + y)(x-y) meets the requirement II. cannot be factorized therefore does not meet the requirement. III.=x(x + y)-(x + y)= (x-1)(x+ y) meets the requirement. Therefore the answer should be C.5AEEC82B53E1B405