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=
1.2×0.4+0.4×1.3= 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=
1.2×0.4+0.4×1.3= 4×（1.5+0.25）=
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