Question

0.67 x99十0.67怎样简便算

Answer 1

逆用乘法分配律（或叫提取公因式法） 计算简单
0.67 x99十0.67
=0.67×99+0.67×1
=0.67×（99+1）
=0.67×100
=67

Answer 2

=0.67×99+0.67×1
=0.67×（99+1）
=0.67×100
=67

Answer 3

把7.5分成7和0.5，再分开成