[4a^2b^2(3b^2-5ab)-a^2(-2b)^3]/8a^2b^3
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解 原式=4a^2b^3(3b^2-5a+2)/(8a^2b^3).

=(1/2)(3b^2-5a+2).

原式=5*(-6)*(-2)(10^(5-2+2).

=60*10^5.

=6*10^6.

原式=[(1/2x+y+1/2x-y)(1/2x+y-(1/2x-y)]/(-4xy.

=2xy/(-4xy).

=-1/2.

原式=a^3b+2a^2b^2+ab^3 .[原题求:a^2b+2a^b^2+ab^3,可能有误]

=ab(a^2+2ab+b^2)

=ab(a+b)^2.

=2*(2/3)^2.

=8/9.

已知:A=3x^2-2y+1.B=x^2-y,

求(1) A-2B.

A-2B=3x^2-2y+1-2*(x^2-y).

=3x^2-2y+1-2x^2+2y.

=x^2+1.

(2) A*B=(3x^2-2y+1)*(x^2-y)

=3x^4-3x^2y-2x^2y+2y^2+x^2-y.

=3x^4-5x^2y+x^2-y+2y^2.

=3x^4-(5y-1)x^2+2y^2-y.

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