详细步骤写在纸上了
36×28+72×86 =36×28+36×172=36×(28+172)=36×200=7200
=72x14+72x86=72x(14+86)=7200
=72×(14+86)=7200。
36x28+72x86=36x2x14+72x86=72x14+72x86=72x(14+86)=72x100=7200