已知x+y=a,求(x+y)³(2x+2y)³(3x+3y)³的值
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已知x+y=a,求(x+y)³(2x+2y)³(3x+3y)³的值
已知x+y=a,求(x+y)³(2x+2y)³(3x+3y)³的值
已知x+y=a,求(x+y)³(2x+2y)³(3x+3y)³的值
(x+y)³(2x+2y)³(3x+3y)³
=(a)³(2a)³(3a)³
=a³ ×8a³ ×27a³
=216a的9次方
(x+y)³(2x+2y)³(3x+3y)³=a³(2a)³(3a)³=8*27a^9=216a^9
(2x+2y)³=8(x+y)³=8a³
(3x+3y)³=27(x+y)³=27a³
(x+y)³(2x+2y)³(3x+3y)³=a³8a³27a³=216a^9
(x+y)³(2x+2y)³(3x+3y)³
=(x+y)³·[2(x+y)]³·[3(x+y)]³
=[(x+y)·2(x+y)·3(x+y)]³
=[6(x+y)³]³
=216(x+y)^9
=216a^9