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2个回答
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x=y+3
x-y=3
1/4(x-y)²-3/10(x-y)+3/4(x-y)²+13/10(x-y)
=(x-y)²+(x-y)
=3²+3
=9+3
=12
x-y=3
1/4(x-y)²-3/10(x-y)+3/4(x-y)²+13/10(x-y)
=(x-y)²+(x-y)
=3²+3
=9+3
=12
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