43.8×16.97-79.7×4.38+43.8的简算
问题描述：
43.8×16.97-79.7×4.38+43.8的简算
答
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)
答
=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