5.25×8.2+5.25×0.8+5.25=5.25×(8.2+0.8+1)=5.25×10=52.5
5.25x8.2+5.25x0.8+5.25=5.25x(8.2+0.8+1)=5.25x10=52.5
=5.25×(8.2+0.8+1)=5.25×10=52.5
收到了吗?