简便计算 9.99*10.1 14.8*6.3-6.3*6.5？
展开全部
9.99×10.1
=(10-0.01)×10.1
=10×10.1-0.01×10.1
=101-0.101
=100.899
或
9.99×10.1
=9.99×10+9.99×0.1
=99.9+0.999
=100.899
14.8×6.3-6.3×6.5+6.3×1.7
=6.3×(14.8-6.5+1.7)
=6.3×10=63
9.46-2.73-6.27
=9.46-(2.73+6.27)
=9.46-9
=0.46
=(10-0.01)×10.1
=10×10.1-0.01×10.1
=101-0.101
=100.899
或
9.99×10.1
=9.99×10+9.99×0.1
=99.9+0.999
=100.899
14.8×6.3-6.3×6.5+6.3×1.7
=6.3×(14.8-6.5+1.7)
=6.3×10=63
9.46-2.73-6.27
=9.46-(2.73+6.27)
=9.46-9
=0.46
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