简便计算图
72×26+36×48=36×2×26+36×48=36×(2×26+48)=36×(52+48)=36×100=3600
72×26+ 36×48=36x2x26+36x48=36x(52+48)=36x100=3600
72×26+36×48=36x(2x26+48)=36x100=3600
36×(2×26+48)=3600