Question

脱式计算:一、用简便计算下面各题。⑤12/13×12+12/13 = = = =

Answer 1

如图所示

Answer 2

12/13×12+12/13简便计算
解:原式=12/13×12+12/13×1
=12/13×（12+1）
=12/13×13
=12
分析:
运用乘法结合律计算。