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) =