已知(m-n)²=8,(m+n)²=2,则㎡+n²= A.10 B.6 C.已知(m-n)²=8,(m+n)²=2,则㎡+n²= A.10 B.6 C. 5 D.3 为啥 算式
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已知(m-n)²=8,(m+n)²=2,则㎡+n²= A.10 B.6 C.已知(m-n)²=8,(m+n)²=2,则㎡+n²= A.10 B.6 C. 5 D.3 为啥 算式
已知(m-n)²=8,(m+n)²=2,则㎡+n²= A.10 B.6 C.
已知(m-n)²=8,(m+n)²=2,则㎡+n²= A.10 B.6 C. 5 D.3 为啥 算式
已知(m-n)²=8,(m+n)²=2,则㎡+n²= A.10 B.6 C.已知(m-n)²=8,(m+n)²=2,则㎡+n²= A.10 B.6 C. 5 D.3 为啥 算式
答案为C
(m-n)2=m2-2mn+n2=8
(m+n)2=m2+2mn+n2=2
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