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已知x+y=1/2,求(x+y)^3 * (2x+2y)^3 * (3x+3y)^3的值?
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(x+y)^3 * (2x+2y)^3 * (3x+3y)^3
=(1/2)^3+(1)^3*(3/2)^3
=(1/2*1*3/2)^3
=(3/4)^3
=27/64
=(1/2)^3+(1)^3*(3/2)^3
=(1/2*1*3/2)^3
=(3/4)^3
=27/64
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