题目

列竖式计算。18-1.56= 7.9+23.91= 16+2.45= 187.6-28= 2.04+0.8= 3.05-1.999=2.0 5 5×2.4 = 0.672÷4.2= 0.73×2.42=0.125×2.5 = 7.8×106 = 5.83×2=3.7÷2.5 = 101×0.41= 38×0.68=14.3×0.02= 91.2÷0.24=12.6÷3.5=5.8×6.9= 4.28÷0.4= 2.1×0.88=0.756÷0.18= 21.24÷3.6= 3.77×1.8= 5.6×2.9= 0.72×0.06= 0.68×0.12= 答案：【答案】16.44 31.81 18.45 159.6 2.84 1.051 4.932 0.16 1.7666 0.3125 826.8 11.66 1.48 41.41 25.84 0.286 380 3.6 40.02 10.7 1.848 4.2 5.9 6.786 16.24 0.0432 0.0816【解析】略2．PM2.5指环境空气中直径小于或等于2.5μm，即不大于2.5×10-6m的颗粒物，它在空气中含量浓度越高，就代表空气污染越严重．