当m=0.75,n=0.25时,求m²-m-n²-n分之m²+m-n²+n的值
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当m=0.75,n=0.25时,求m²-m-n²-n分之m²+m-n²+n的值
当m=0.75,n=0.25时,求m²-m-n²-n分之m²+m-n²+n的值
当m=0.75,n=0.25时,求m²-m-n²-n分之m²+m-n²+n的值
m²-m-n²-n
=(m²-n²)-(m+n)
=(m+n)(m-n)-(m+n)
=(m+n)(m-n-1)=-0.5
m²+m-n²+n
=(m²-n²)+(m+n)
=(m+n)(m-n)+(m+n)
=(m+n)(m-n+1)=1.5