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化简并求值:(m+n)^2+(m+n)(m-3n)其中m=√2,n=1o(╯□╰)oo(╯□╰)oo(╯□╰)oo(╯□╰)oo(╯□╰)oo(╯□╰)oo(╯□╰)oo(╯□╰)oo(╯□╰)oo(
化简并求值:(m+n)^2+(m+n)(m-3n)其中m=√2,n=1o(╯□╰)oo(╯□╰)oo(╯□╰)oo(╯□╰)oo(╯□╰)oo(╯□╰)oo(╯□╰)oo(╯□╰)oo(╯□╰)oo(╯□╰)oo(╯□╰)oo(╯□╰)oo(╯□╰)oo(╯□╰)oo(╯□╰)oo(
化简并求值:(m+n)^2+(m+n)(m-3n)其中m=√2,n=1
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化简并求值:(m+n)^2+(m+n)(m-3n)其中m=√2,n=1o(╯□╰)oo(╯□╰)oo(╯□╰)oo(╯□╰)oo(╯□╰)oo(╯□╰)oo(╯□╰)oo(╯□╰)oo(╯□╰)oo(╯□╰)oo(╯□╰)oo(╯□╰)oo(╯□╰)oo(╯□╰)oo(╯□╰)oo(
(m+n)²+(m+n)(m-3n)
化简:(m²+2mn+n²)+m²-3mn+mn-3n²
=2m²-2n²
=2(m²-n²)
把m=√2,n=1代入,得
2×[(√2)²-1²]
=2
结果是2
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