填空 1、x²+6xy+__=(__+__)² 2、( )²+3/2xy+y²=(__+__)²
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填空 1、x²+6xy+__=(__+__)² 2、( )²+3/2xy+y²=(__+__)²
填空 1、x²+6xy+__=(__+__)² 2、( )²+3/2xy+y²=(__+__)²
填空 1、x²+6xy+__=(__+__)² 2、( )²+3/2xy+y²=(__+__)²
x²+6xy+9y²=(x+3y)²
( 3/4x)²+3/2xy+y²=(3/4x+y)²
x²+6xy+_9y^2_=(_x_+_3y_)² ,
(3x/4 )²+3/2xy+y²=(3x/4__+_y_)²