99X43+43=99X43+43X1(后面的43也乘以1,得数不变,再根据乘法分配律简便计算)=(99+1)X43 或43X(99+1)(根据(A+B)XC=AXB+BXC)=100X43=4300
99X43+43=99X43+43X1=43X(99+1)(乘法分配律)=100X43=4300
99*43+43=43*(99+1)=43*100=4300