简算41.2×8.1 4.12×23-412×0.04 要步骤的啊,谢谢!
1.76除以412点24目录
4.12?8 .1 11?1.25 53.7?1.9简便方法?
简算41.2×8.1 4.12×23-412×0.04 要步骤的啊,谢谢!
(简便计算)41.2x8.1 11x1.25 53.7x1.9
4.12?8 .1 11?1.25 53.7?1.9简便方法?
简便计算
过程如下,望采纳
41.2x8 .1 11x1.25 53.7ⅹ1.9
=41.2x8 .1 1.1x12.5 (41.2 12.5)x1.9
=41.2×(8 .1 1.9) 12.2×(1.1 1.9)
=41.2×10 12.5
×3
=412 37.5
=449.5
简算41.2×8.1 4.12×23-412×0.04 要步骤的啊,谢谢!
41.2×8.1 4.12×23-412×0.04
=41.2×8.1 41.2×2.3-41.2×0.4
=41.2×(8.1 2.3-0.4)
=41.2×10
=412
(简便计算)41.2x8.1 11x1.25 53.7x1.9
41.2x8.1 11x1.25 53.7x1.9
=41.2x8.1 41.2×1.9 12.5×1.9 1.1x12.5
=41.2×(8.1 1.9) 12.5×(1.9 1.1)
=41.2×10 12.5×3
=412 37.5
=449.5
解答分析:
此题的重点是把53.7x1.9 拆分成41.2×1.9 12.5×1.9
然后按乘法分配律分组进行计算。
乘法分配律公式a×b a×c=a×(b c)
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