(-1/2x+1/3y)(______)=-1/9y^2+1/4x^2
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(-1/2x+1/3y)(______)=-1/9y^2+1/4x^2(-1/2x+1/3y)(______)=-1/9y^2+1/4x^2(-1/2x+1/3y)(______)=-1/9y^2+1
(-1/2x+1/3y)(______)=-1/9y^2+1/4x^2
(-1/2x+1/3y)(______)=-1/9y^2+1/4x^2
(-1/2x+1/3y)(______)=-1/9y^2+1/4x^2
(-1/2x+1/3y)(-1/2x-1/3y)=-1/9y^2+1/4x^2
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(-1/2x+1/3y)(_-1/2x-1/3y_)=-1/9y^2+1/4x^2
思路:
-1/9y^2+1/4x^2
=1/4x^2-1/9y^2
=(1/2x-1/3y)(1/2x+1/3y)
=-(-1/2x+1/3y)(1/2x+1/3y)
=(-1/2x+1/3y)(-1/2x-1/3y)
等号右边=(x/2-y/3)(x/2+y/3)
所以括号内填 x/2-y/3 二分之一x 减去三分之一y.
(-1/2x+1/3y)(______)=-1/9y^2+1/4x^2
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