Question

9.9x6.6+6.3x10.2简便计算？

Answer 1

9.9Ⅹ6.6+6.3x10.2
＝（10-0.1）x6.6＋6.3x（10+0.2）
＝66-0.66+63+1.26
＝129+0.6
＝129.6

Answer 2

9.9×6.6+6.3×10.2的简便算法就把两个接近10的数字给它转换成10，9.9变成10减0.1 10.2变成10+0.2，这样计算起来就会容易很多。

Answer 3

9.9×6.6+6.3×10.2

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=(10－0.1)×6.6+6.3×(10+0.2)

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=66－0.66+63+1.26

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=66+63+1.26－0.66

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=129+0.6

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=129.6

Answer 4

9.9x6.6+6.3x10.2
=(10-0.1)x6.6+6.3x(10+0.2)
=66-0.66+63+1.26
=66+63+1.26-0.66
=129+0.6
=129.6

Answer 5

9.9*6.6+6.3*10.2
=6.6*（10-0.1）+6.3*（10+0.2）
=66-0.66+63+1.26
=129+（1.26-0.66）
=129+0.6
=129.6