32*0.63*0.95/1.6*21*1.9=32/1.6*0.63*0.95/21/1.9=20*0.63*0.95/21/1.9=19/1.9*0.63/21=6.3/21=0.3
（32×0.63×0.95）÷（1.6×21×1.9）=（32÷1.6）×（0.63÷21）×（0.95÷1.9）=20×0.03×0.5=（20×0.5）×0.03=10×0.03=0.3
