m²+2mn+n²-6m-6n+9怎么解·呢?
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m²+2mn+n²-6m-6n+9怎么解·呢?
m²+2mn+n²-6m-6n+9怎么解·呢?
m²+2mn+n²-6m-6n+9怎么解·呢?
m²+2mn+n²-6m-6n+9
=(m+n)^2-6(m+n)+9
=(m+n-3)^2
完全平方式
原式=(m+n)²-6(m+n)+9
=(m+n-3)²大括号{χ-y/2-4=y+5/3 χ-y-9=y+5/3怎么解?χ-y/2-4=y+5/3 χ-y-9=y+5/3 原方程组可化为 x-3y/2=17/3① x-2y=32/3② ②-①得 y/2=5 y=10 把y=10代入②得 x-20=32/3 x=62/3 ∴x=62/3 y=1...
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原式=(m+n)²-6(m+n)+9
=(m+n-3)²
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