问题标题:
求帮忙做几道数学计算题-2^3-(-2)^2+(-3)^2-(-1)^3(-2xy^2)^2(-0.5x^2y^3)(-2/3x^2y^3)(x-2y+1)(x+2y-1)5*399/8+5*1/8(x-2y)(x+2y)(x^2-4y^2)
问题描述:
求帮忙做几道数学计算题
-2^3-(-2)^2+(-3)^2-(-1)^3
(-2xy^2)^2(-0.5x^2y^3)(-2/3x^2y^3)
(x-2y+1)(x+2y-1)
5*399/8+5*1/8
(x-2y)(x+2y)(x^2-4y^2)
唐远炎回答:
5)(x-2y)(x+2y)(x^2-4y^2)=(x^2-4y^2)*(x^2-4y^2)=x^4-2(x^2)*(4y^2)+16y^44)5*399/8+5*1/8=1/8(5*399+5*1)=1/8*(5*400)=5*50=2503)(x-2y+1)(x+2y-1)=(x-(2y-1))(x+(2y-1))=x^2-(2y-1)*(2y-...
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