因m2=2n+3,n2=2m+3所以 m2-n2=(2n+3)-(2m+3)所以 (m+n)(m-n)=2(n-m),⑴m=n时,m2=2m+3,解得:m=-1或m=3,所以 m=n=-1或m=n=3当①m=n=-1时,m3+n3=-2;当②m=n=3时,m3+n3=54,⑵当m≠n时,m+n=-2,所以 n=-m-2,所以 m2=2(-m-2)+3,所以 m2+2m+1=0,解得:m=n=-1舍去,综上m3+n3的值为-2或54.
m2=2n+3 n2=2m+3 求m3+n3的和
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