简便方法,3.12×0.99＋31.2×0.001
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简便方法,3.12×0.99＋31.2×0.001简便方法,3.12×0.99＋31.2×0.001简便方法,3.12×0.99＋31.2×0.0013.12×0.99＋31.2×0.001=3.12
简便方法,3.12×0.99＋31.2×0.001
简便方法,3.12×0.99＋31.2×0.001
简便方法,3.12×0.99＋31.2×0.001
3.12×0.99＋31.2×0.001
=3.12×0.99＋3.12×0.01
=3.12×(0.99+0.01)
=3.12×1
=3.12