如果m十n=3 那么2m²十4mn十2n²-6=?
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![如果m十n=3 那么2m²十4mn十2n²-6=?](/uploads/image/z/1124311-31-1.jpg?t=%E5%A6%82%E6%9E%9Cm%E5%8D%81n%EF%BC%9D3+%E9%82%A3%E4%B9%882m%26%23178%3B%E5%8D%814mn%E5%8D%812n%26%23178%3B%EF%BC%8D6%3D%3F)
如果m十n=3 那么2m²十4mn十2n²-6=?
如果m十n=3 那么2m²十4mn十2n²-6=?
如果m十n=3 那么2m²十4mn十2n²-6=?
2m²十4mn十2n²-6=2(m²+2mn十n²)-6=2(m+n)²-6
=18-6=12
2(M+N)^2-6=12
2m²十4mn十2n²-6
=2(m²十2mn十n²)-6
=2(m+n)²-6=2*9-6=12