31.8×7.9-2.5×210%+44.3×2.1的简便计算方法
1个回答
展开全部
31.8×7.9-2.5×210%+44.3×2.1的简便计算方法
31.8×7.9-2.5×210%+44.3×2.1
=31.8×7.9+44.3×2.1-2.5×2.1
=31.8×7.9+（44.3-2.5）×2.1
=31.8×7.9+41.8×2.1
=31.8×7.9+31.8×2.1+10×2.1
=31.8×（7.9+2.1）+21
=31.8×10+21
=318+21
=339
31.8×7.9-2.5×210%+44.3×2.1
=31.8×7.9+44.3×2.1-2.5×2.1
=31.8×7.9+（44.3-2.5）×2.1
=31.8×7.9+41.8×2.1
=31.8×7.9+31.8×2.1+10×2.1
=31.8×（7.9+2.1）+21
=31.8×10+21
=318+21
=339
本回答被网友采纳
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
