5.13×99+0.153×10
=5.13x(100-1) +1.53
=513-5.13+1.53
=513-3.6
=509.4
5.13×99+0.153×10=(5.13×100-5.13)+1.53=507.87+1.53=509.4如果是 5.13×99+0.513×10=5.13×99+5.13×1=5.13×(99+1)=513
5.13*99+0.153*10
这道题是不是写错了,应该是5.13*99+0.513*10吧
5.13×99+0.513×10
=5.13×99+5.13
=5.13×(99+1)
=5.13×100
=513