10×0,87+100×0,035+21,3= 8,7+3,5+21,3= 33,5
100×0,87+1000×0,035+10×21,3= 87+35+213= 335
0,1×0,87+0,01×0,035+21,3= 0,087+0,00035+21,3= 21,3905
