m+n=8,mn15,求m²-mn+n²的值

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m+n=8,mn15,求m²-mn+n²的值m+n=8,mn15,求m²-mn+n²的值m+n=8,mn15,求m²-mn+n²的值原式=m

m+n=8,mn15,求m²-mn+n²的值
m+n=8,mn15,求m²-mn+n²的值

m+n=8,mn15,求m²-mn+n²的值
原式=m²+2mn+n²-3mn
=(m+n)²-3mn
=8²-3×15
=19