1（2x+5y）平方 2(1/3m-1/2)平方 3（-2t-1）平方 4（1/5x+1/10y）平方 本人急 快帮帮
2个回答
展开全部
(2x+5y)² = (2x)² +2×2x×5y+(5y)² = 4x² +20xy+25y²
(1/3m-1/2) = (1/3m)² -2×1/3m×1/2+(1/2)² = 1/9m² -1/3m+1/4
(-2t-1)² = (2t+1)² = (2t)² +2×2t×1+1² = 4t² + 4t + 1
(1/5x+1/10y)²= (1/5x)² +2×1/5x×1/10y+(1/10y)² = 1/25x² +1/25xy+1/100y²
(1/3m-1/2) = (1/3m)² -2×1/3m×1/2+(1/2)² = 1/9m² -1/3m+1/4
(-2t-1)² = (2t+1)² = (2t)² +2×2t×1+1² = 4t² + 4t + 1
(1/5x+1/10y)²= (1/5x)² +2×1/5x×1/10y+(1/10y)² = 1/25x² +1/25xy+1/100y²
本回答由提问者推荐
已赞过
已踩过<
评论
收起
你对这个回答的评价是？
推荐律师服务：
若未解决您的问题，请您详细描述您的问题，通过百度律临进行免费专业咨询
