12.8+0.7+5.490的简便运算
怎么进行简便计算12.5×(7.8×1.6+0.2×1.6)7.4×5.6+7.4×5.4-74×0.19.9×9.9+1.99...
怎么进行简便计算
12.5 ×(7.8×1.6+0.2×1.6)
7.4×5.6+7.4×5.4-74×0.1
9.9×9.9+1.99 展开
12.5 ×(7.8×1.6+0.2×1.6)
7.4×5.6+7.4×5.4-74×0.1
9.9×9.9+1.99 展开
1个回答
展开全部
12.5 ×(7.8×1.6+0.2×1.6)
=12.5×((7.8+0.2)*1.6)
=12.5*8*1.6
=100*1.6
=160
7.4×5.6+7.4×5.4-74×0.1
=7.4×5.6+7.4×5.4-7.4×1
=7.4×(5.6+5.4-1)
=7.4×10
=74
9.9×9.9+1.99
=9.9×9.9+1+0.99
=9.9×9.9+1+9.9×0.1
=9.9×(9.9+0.1)+1
=9.9×10+1
=100
=12.5×((7.8+0.2)*1.6)
=12.5*8*1.6
=100*1.6
=160
7.4×5.6+7.4×5.4-74×0.1
=7.4×5.6+7.4×5.4-7.4×1
=7.4×(5.6+5.4-1)
=7.4×10
=74
9.9×9.9+1.99
=9.9×9.9+1+0.99
=9.9×9.9+1+9.9×0.1
=9.9×(9.9+0.1)+1
=9.9×10+1
=100
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
|
广告 您可能关注的内容 |
