已知x+y=a求(x+y)³(2x+2y)³(3x+3y)的值

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已知x+y=a求(x+y)³(2x+2y)³(3x+3y)的值

原式=(x+y)³[2(x+y)]³[3(x+y)]
=(x+y)³*8(x+y)³*3(x+y)
=24(x+y)^7
=24a^7

(x+y)³(2x+2y)³(3x+3y)
=(x+y)³[2(x+y)]³[3(x+y)]
=(x+y)³×8×(x+y)³×3×(x+y)
=24(x+y)^7
=24a^7