1.57+1.43-1.57+1.43简便计算
问题描述:
1.57+1.43-1.57+1.43简便计算
答
2.86
答
1.57-1.57+1.43+1.43
=2.86
答
1.57+1.43-1.57+1.43
=(1.57-1.57)+(1.43+1.43)
=0+2.86
=2.86