4.4×57.8+45.3×5.6
问题描述：
4.4×57.8+45.3×5.6
越快解决越好
答
=4.4×(45.3+12.5)+45.3×5.6
=4.4×45.3+4.4×12.5+45.3×5.6
=45.3×(4.4+5.6)+11×0.4×2.5×5
=453+55
=508