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)=