计算 ① 3(2-y)²-4(y+5)² ② (m-n-1)·(m-n+1)
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计算 ① 3(2-y)²-4(y+5)² ② (m-n-1)·(m-n+1)
计算 ① 3(2-y)²-4(y+5)² ② (m-n-1)·(m-n+1)
计算 ① 3(2-y)²-4(y+5)² ② (m-n-1)·(m-n+1)
是化简还是怎样.