帮忙看看这题,谢谢!

2024-12-27 17:49:29
推荐回答(3个)
回答1:

10×2.45+3.6×4.9 =24.5+17.64 =42.14

回答2:

x/4=y/x-4
x/x-4=4/y

回答3:

CE=4/7