多項式與多項式相乘題目!
(X 1)(X 2)(X 3) (X-Y)平方-(X Y)(X-Y)
(X 1)(X-2)(X-3)網友廻答：
- (X 1)(X 2)(X 3)
=(x^2 3x 2)(x 3)
=(x^3 3x^2 2x) (3x^2 9x 6)
=x^3 6x^2 11x 6
(X-Y)平方-(X Y)(X-Y)
=(x^2-2xy y^2)-(x^2-y^2)
=2y^2-2xy
網友廻答：
- 1.(X 1)(X 2)(X 3) =(X 2-1)(X 2)(X 2 1)=(X 2)([(X 2)^2-1)=(X 2)^3-(X 2)=X^3 6X^2 12X 4-X-2=X^3 6X^2 11X 22.(X-Y)平方-(X Y)(X-Y)=(X-Y)^2-(X^2-Y^2)=X^2-2XY Y^2-X^2 Y^2=2Y^2-2XY3.(X 1)(X-2)(X-3)=(X-1 2)(X...
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