Question

求解数学简便运算，要详细点的解答！

1、78×301-78

2、45×98+90

Answer 1

1、解：原式= 78×301 -78x1
=78x（301-1）
= 78x300
=23400

2、解：原式= 45×98+45x2
=45x（98+2）
=45x100
=4500

Answer 2

解：78×301-78=78×﹙301-1﹚=78×300=23400
45×98+90=45×98+45×2=45×﹙98+2﹚=45×100=4500
满意请采纳，祝你学习进步

Answer 3

1、78×301-78 =78(301-1) =78*300=23400
2、45×98+90=45×98+45×2=45(98+2)=45*100=4500

Answer 4

• =(80-2)x(301-1)=(80-2)x300=24000-600=23400

• =45x(98+2)=45x100=4500
  

Answer 5

1=78x(301-1)=78x300=23400
2=45X98+45X2=45x(98+2)=4500

Answer 6

1 提取公因数78变成78乘以（301-1）就是78乘300=23400
2 90=45x2原式变成45x98+45x2=45x(98+2)=45x100=4500