79乘12.
问题描述：
79乘12.
答
79×12.5=（80-1）×12.5=80×12.5-12.5=1000-12.5=987.5教学通jxt123com/shuxue.htm网免费数学试卷课件下载
答
79x12.5
=(80-1)x12.5
=80x12.5-12.5
=1000-12.5
=997.5
答
79*12.5
=(80-1)*12.5
=80*12.5-12.5
=1000-12.5
=1000-12-0.5
=988-0.5
=987.5