普吉岛燕窝怎么样:43.8×16.97-79.7×4.38+43.8的简算
来源:百度文库 编辑:中科新闻网 时间:2024/05/01 20:41:20
=4.38*169.7-4.38*79.7+4.38*10
=4.38*(169.7-79.7+10)
=4.38*100
=438
注明:
43.8*16.97
=(4.38*10)*16.97
=4.38*(10*16.97)
=4.38*169.7
43.8×16.97-79.7×4.38+43.8
=43.8×16.97-79.7×4.38+43.8×1
=43.8×(16.97-79.7+1)