等于4.68×3.6＋5.4×4.68＋4.68＝4.68×（3.6＋5.4＋1）＝4.68×10＝46.8
4.68乘以括号里边3.6+5.4+1结果等于46.8
=4.68x(3.6+5.4+1)=4.68x10=46.8
