Question

9.98×0.3+0.5×99.8+0.094×499,怎样用简便计算？

Answer 1

9.98×0.3+0.5×99.8+0.094×499,怎样用简便计算？
解题思路：不能进行简便运算的按顺序计算，简便运算核心是运用加法和乘法各种定律进行计算，计算出整数部分方便后续计算的过程
解题过程：

9.98×0.3+0.5×99.8+0.094×499

=9.98×0.3+0.5×99.8+0.094×50×9.98

=9.98×（0.3+5+4.7）
=9.98×10
=99.8

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Answer 2

解：9.98×0.3+0.5×99.8+0.094×499

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=9.98×0.3+0.5×9.98×10+0.047×2×499

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=9.98×0.3+5×9.98+0.047×998

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=9.98×0.3+5×9.98+0.047×9.98×100

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=9.98×0.3+5×9.98+4.7×9.98

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=9.98×(0.3+5+4.7)

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=9.98×10

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=99.8

Answer 3

简便计算
9.98×0.3+0.5×99.8+0.094×499
=9.98x0.3+5x9.98+0.094x50x9.98
=9.98x（0.3+5+4.7）
=9.98x10
=99.8