-1,+3,-5,4,怎么运用学过的法则算成24?

问题描述:

-1,+3,-5,4,怎么运用学过的法则算成24?

(4+(-1))*(3-(-5))
=3*8=24

[-1-(-5-4)]*3=24

3x[4-1-(-5)]=24