Question

9.9×6.3+0.63和10.1×8.5-0.83的简便方法怎么计算? 急!

Answer 1

9.9×6.3+0.63
=9.9×6.3＋6.3×0.1……变一变就简便
=6.3×（9.9＋0.1）
=63

10.1×8.5-0.83
=（10＋0.1）×8.5－0.83
=85＋（0.85－0.83）
=85＋0.02
=85.02

Answer 2

9.9×6.3+0.63
=99×0.63+1×0.63
=(99+1)×0.63
=100×0.63
=63

10.1×8.5-0.85
=101×0.85-1×0.85
=(101-1)×0.85
=100×0.85
=85
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Answer 3

9.9×6.3+0.63
=99×0.63+1×0.63
=(99+1)×0.63
=100×0.63
=63

10.1×8.5-0.85
=101×0.85-1×0.85
=(101-1)×0.85
=100×0.85
=85

Answer 4

9.9×6.3+0.63=（10-0.1）×6.3+6.3=63
10.1×8.5-0.83=（10+0.1）×8.5-0.83=85.02
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