已知(m+2n)²=26,(2m-n)²=4,则m²+n²得值为
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![已知(m+2n)²=26,(2m-n)²=4,则m²+n²得值为](/uploads/image/z/1124307-27-7.jpg?t=%E5%B7%B2%E7%9F%A5%28m%2B2n%29%26%23178%3B%3D26%2C%282m-n%29%26%23178%3B%3D4%2C%E5%88%99m%26%23178%3B%2Bn%26%23178%3B%E5%BE%97%E5%80%BC%E4%B8%BA)
已知(m+2n)²=26,(2m-n)²=4,则m²+n²得值为
已知(m+2n)²=26,(2m-n)²=4,则m²+n²得值为
已知(m+2n)²=26,(2m-n)²=4,则m²+n²得值为
已知(m+2n)²=26,(2m-n)²=4
那么(m+2n)²+(2m-n)²=m²+4mn+4n²+4m²-4mn+n²=5(m²+n²)=26+4=30
所以m²+n²=6