72×89+72用最简便方法计算

72×89+72
=72×（89+1）
=72×90
=6480

原式
=72x89+72x1
=72x(89+1)
=72x90
=70x90+2x90
=6300+180
=6480

72×89+72
=72×（89+1）
=72×90
=72×（100-10）
=72×100-72×10
=7200-720
=6480

72×89+72
=72x89+72x1
=72x(89+1)
=72x90
=72x(100-10)
=72x100-72x10
=7200-720
=6480

72×89+72
=72×(89+1)
=72×90
=6480