问题描述: 25x(5+10) 36x34+36x66 125x79 83+83x99 75x101-75 32x4x25 125x7x8 25x58x4 678+591+409 四年级 1个回答 分类:数学 2020-03-24 问题解答: 我来补答 25x(5+10) =(20+5)x15 =300+75 =375 36x34+36x66 =36x(34+66) =36x100 =3600 125×79 =125×(80-1) =125×80-125×1 =10000-125 =9875 83+83×99 =83+83×(100-1) =83×100-83×1 =8300 75x101-75 =75x101-75x1 =75x(101-1) =75x100 =7500 32x4x25 =32x(4x25) =32x100 =3200 125x7x8 =(125x8)x7 =1000×7 =7000 25x58x4 =25x4x58 =100x58 =5800 678+591+409 =678+(591+409) =678+1000 1678 展开全文阅读