2又1/4×8/9+2.25×1/9+9/4简便计算

问题描述:

2又1/4×8/9+2.25×1/9+9/4简便计算

2又1/4×8/9+2.25×1/9+9/4
=9/4×8/9+9/4×1/9+9/4
=9/4×(8/9+1/9+1)
=9/4×2
=9/2