(m-2n+p)²等于多少?
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(m-2n+p)²等于多少?
(m-2n+p)²等于多少?
(m-2n+p)²等于多少?
(m-2n+p)² =[(m-2n)+p]X[(m-2n)+p]=(m-2n)² +2(m-2n)p+p² = m² -4mn+4n²+2mp-4np+p²
亲,以后可用这个公式 (a+b+c) ² = a² + b² + c² +2ab+2ac+2bc 解题.