54.2-(2/9)+4.8-(16/9) = 57 简便计算!
问题描述：
54.2-(2/9)+4.8-(16/9) = 57 简便计算!
答
54.2-(2/9)+4.8-(16/9)
＝542/10－2/9＋48/10－16/9
＝542/10＋48/10－2/9－16/9
＝590/10－（2/9＋16/9）
＝59－2
＝57
答
54.2-(2/9)+4.8-(16/9)
＝﹙54.2＋4.8﹚－﹙2/9＋16/9﹚
＝59－18/9
＝59－2
＝57
﹙希望能帮到您！﹚
答
54.2-(2/9)+4.8-(16/9)
=(54.2+4.8)-(2/9+16/9)
=59-18/9
=59-2
= 57