请教初中数学问题,求高手解答,要有详细步骤哦~
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3. = [(x-2y)(x-2y+x+2y)-2x(2x-y)]+2x 提取公因式 x-2y
= [(x-2y)*2x-2x(2x-y)]+2x
= 2x(x-2y-2x+y)+2x 提取公因式 2x
= -2x*(x+y)+2x = 2x(1-x-y) = 10*(1-5+6) =20
4.x^4+4x^2+16=(x^6-4^3)/(x^2-4)
f(x)*g(x)=x^6-64
5.=2x(4x^2-25)-(1+8x^3)
=8x^3-50x-1-8x^3
=-50x-1=24
解得 x=-0.5
= [(x-2y)*2x-2x(2x-y)]+2x
= 2x(x-2y-2x+y)+2x 提取公因式 2x
= -2x*(x+y)+2x = 2x(1-x-y) = 10*(1-5+6) =20
4.x^4+4x^2+16=(x^6-4^3)/(x^2-4)
f(x)*g(x)=x^6-64
5.=2x(4x^2-25)-(1+8x^3)
=8x^3-50x-1-8x^3
=-50x-1=24
解得 x=-0.5
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