0.4×99+0.4.

解:0.4×99+0.4×1,
=0.4×(99+1),
=0.4×100,
=40.
分析:化0.4=0.4×1,運用乘法分配律解答.
點評:本題主要考查學(xué)生運用乘法分配律解決問題的能力.
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