Question

3.4×7-34×0.7,如何用简便方法计算？

Answer 1

解:该题用简便方法计算，可提取题目中两个相同的0.7即可:
3.4X7一34Ⅹ0.7
=0.7X10Ⅹ3.4一34X0.7
=0.7X(34一34)
=0.7X0
=0

Answer 2

3.4×7一34×0.7
＝3.4×7一3.4×7
＝0

Answer 3

3.4×7-34×0.7
＝34×0.7-34×0.7
＝0
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