(7⼀9+4⼀21-3⼀7)*6.3

2024-12-26 13:38:26
推荐回答(1个)
回答1:

(7/9+4/21-3/7)*6.3
=7/9*6.3+4/21*6.3-3/7*6.3
=4.9+1.2-2.7
=3.4