脱式计算,能简算的要简算.1.23/6/0.5,81/1.62*2.4,6.42*5.7+1.43*64.2,0.75*18/0.15,2.5*6.9*4,2.07/0.23/0.45
问题描述：
脱式计算,能简算的要简算.1.23/6/0.5,81/1.62*2.4,6.42*5.7+1.43*64.2,0.75*18/0.15,2.5*6.9*4,
2.07/0.23/0.45
答
1.23÷6÷0.5=0.205÷0.5=0.4181÷1.62×2.4=50×2.4=1206.42×5.7+1.43×64.2=6.42×5.7+14.3×6.42=6.42×（5.7+14.3）=6.42×20=128.40.75×18÷0.15=13.5÷0.15=902.5×6.9×4=2.5×4×6.9=10×6.9=692.07÷0.23...