计算:x(x+2y)-(x+y)^2 a^2(a+b)(a-b)+a^2b^2x(x+2y)-(x+y)^2a^2(a+b)(a-b)+a^2b^2 (1/10)^-2+(2π-3)^0+(-1)^2009 (a-2b-3c)(a-2b+3c)
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计算:x(x+2y)-(x+y)^2 a^2(a+b)(a-b)+a^2b^2x(x+2y)-(x+y)^2a^2(a+b)(a-b)+a^2b^2 (1/10)^-2+(2π-3)^0+(-1)^2009 (a-2b-3c)(a-2b+3c)
计算:x(x+2y)-(x+y)^2 a^2(a+b)(a-b)+a^2b^2
x(x+2y)-(x+y)^2
a^2(a+b)(a-b)+a^2b^2
(1/10)^-2+(2π-3)^0+(-1)^2009
(a-2b-3c)(a-2b+3c)
计算:x(x+2y)-(x+y)^2 a^2(a+b)(a-b)+a^2b^2x(x+2y)-(x+y)^2a^2(a+b)(a-b)+a^2b^2 (1/10)^-2+(2π-3)^0+(-1)^2009 (a-2b-3c)(a-2b+3c)
x(x+2y)-(x+y)^2 =x^2+2xy-x^2-2xy-y^2 =-y^2 a^2(a+b)(a-b)+a^2b^2 =a^2[a^2-b^2+b^2] =a^4 (1/10)^-2+(2π-3)^0+(-1)^2009 =100+1-1 =100 (a-2b-3c)(a-2b+3c) =[(a-2b)+3c][(a-2b)-3c] =(a-2b)^2-(3c)^2 =a^2-4ab+4b^2-9c^2
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