以知x-y=-3,-x+3y=2,求x的平方-4xy+3y的平方的值
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以知x-y=-3,-x+3y=2,求x的平方-4xy+3y的平方的值
x²-4xy+3y²
=(x-3y)(x-y)
=-2×(-3)
=6
x²-4xy+3y²
=(x-3y)(x-y)
=【-(-x+3y)】(x-y)
= -2×(-3)
=6
x的平方-4xy+3y的平方=(x-3y)(x-y)=-(-x+3y)(x-y)=-2×(-3)=6
......
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