(5a-3a²+1-4a三次方)-(-2a²-a三次方)其中a=-2已知m²-mn=21,mn-n²=-15求n²-n²?
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![(5a-3a²+1-4a三次方)-(-2a²-a三次方)其中a=-2已知m²-mn=21,mn-n²=-15求n²-n²?](/uploads/image/z/432158-14-8.jpg?t=%EF%BC%885a-3a%26%23178%3B%EF%BC%8B1-4a%E4%B8%89%E6%AC%A1%E6%96%B9%EF%BC%89-%EF%BC%88-2a%26%23178%3B-a%E4%B8%89%E6%AC%A1%E6%96%B9%EF%BC%89%E5%85%B6%E4%B8%ADa%3D-2%E5%B7%B2%E7%9F%A5m%26%23178%3B-mn%3D21%2Cmn-n%26%23178%3B%3D-15%E6%B1%82n%26%23178%3B-n%26%23178%3B%3F)
(5a-3a²+1-4a三次方)-(-2a²-a三次方)其中a=-2已知m²-mn=21,mn-n²=-15求n²-n²?
(5a-3a²+1-4a三次方)-(-2a²-a三次方)
其中a=-2已知m²-mn=21,mn-n²=-15求n²-n²?
(5a-3a²+1-4a三次方)-(-2a²-a三次方)其中a=-2已知m²-mn=21,mn-n²=-15求n²-n²?
(5a-3a²+1-4a三次方)-(-2a²-a三次方)
=-4a³-3a²+5a+1+a³+2a²
=-3a³-a²+5a+1
=-3x(-2)³-(-2)²+5x(-2)+1
=24-4-10+1
=11
(m²-mn)+(mn-n²)=21-15
m²-n²=6