Question

61X71—61X61简便计算？

Answer 1

简便算法过程如下
61×71-61×61
=61×（71-61）
=61×10
=610
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Answer 2

按表达式的意思解读
有公因式61，所以我们可以提取公因式61

61×71-61×61
=61×（71-61）
=61×10
=610

Answer 3

61X71—61X61
=61X（71—61）
=61X10
=610

Answer 4

61X71—61X61
=61*(71-61)
=61*10
=610