已知(m-n)²=8,(m+n)²=,则m²+n²=(m-n)²=8,(m+n)²=2,则m²+n²=
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已知(m-n)²=8,(m+n)²=,则m²+n²=(m-n)²=8,(m+n)²=2,则m²+n²=
已知(m-n)²=8,(m+n)²=,则m²+n²=
(m-n)²=8,(m+n)²=2,则m²+n²=
已知(m-n)²=8,(m+n)²=,则m²+n²=(m-n)²=8,(m+n)²=2,则m²+n²=
m^2+n^2=((m-n)^2+(m+n)^2)/2=(8+2)/2=5
(m-n)²=8,(m+n)²=2,则
两式相加得
2(m²+n²)=10
则m²+n²=5
(m-n)²=8
m²+n²-2mn=8-----1式
(m+n)²=2
m²+n²+2mn=2------2式
2式+1式
2(m²+n²)=10
m²+n²=5