3/5×17/4+17/5×1/4简便计算=3/5x17/4+1/5x17/4=（3/5+1/5）x17/4=4/5x17/4=17/5
3/5×17/4+17/5×1/4简便计算＝17/5*3/4+17/5*1/4＝17/5*（3/4+1/4）＝17/5* 1＝17/5＝3又2/5
=
如图
=17/4×（3/5+1/5）=17/4×4/5=17/5=3.4
是
