4.6－4.6×0.9
=4.6－4.6×（1－0.1）
=4.6－4.6×1＋4.6×0.1
=4.6－4.6＋0.46
=0.46
4点6减4点6乘0点9（用简便计算,
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4.6－4.6×0.9
=4.6－4.6×（1－0.1）
=4.6－4.6×1＋4.6×0.1
=4.6－4.6＋0.46
=0.46