口算：
0.4×0.02= 3.5＋7.6= 1.23÷3= 2.4×2.5= 16÷1.6= 0.9÷0.01= 7÷0.25= 99×0.25=
12×0.4＋0.4×13= 4×(1.5＋0.25) =
口算：
0.4×0.02= 3.5＋7.6= 1.23÷3= 2.4×2.5= 16÷1.6= 0.9÷0.01= 7÷0.25= 99×0.25=
12×0.4＋0.4×13= 4×(1.5＋0.25) =
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