4.66x0.28+4.66x0.82-4.66=4.66x(0.28+0.82-1)=4.66x1=4.66
4.66×0.28+4.66×0.82-4.66＝4.66×（0.28+0.82-1）＝4.66×（1.1-1）＝4.66×0.1＝0.466
