12356000千克≈ 32578943吨≈
2100÷3= 3×900= 90×70= 203×39≈
13.2×0.913.2 1×0.370.37 25×00.25
4.6×0.780.78 5.6×3.456×0.34 2.5×0.41.25×0.8