口算 0.4×0.02= 1.23÷3= 2.4×2.5= 16÷1.6= 0.9÷0.01= 7÷0.25= 99×0.25= 3.5+7.6
口算0.4×0.02=1.23÷3=2.4×2.5=16÷1.6=0.9÷0.01=7÷0.25=99×0.25=3.5+7.6=1.2×0.4+0.4×1.3=4×(1...
口算 0.4×0.02= 1.23÷3= 2.4×2.5= 16÷1.6= 0.9÷0.01= 7÷0.25= 99×0.25= 3.5+7.6= 1.2×0.4+0.4×1.3= 4×(1.5+0.25)=
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