0.75*4.21-0.21*0.75-0.75的简便计算
问题描述:
0.75*4.21-0.21*0.75-0.75的简便计算
答
=0.75*(4.21-0.21)-0.75
=0.75*4-0.75
=3-0.75
=2.25对吗肯定