3,-4,1,7怎么等于24?

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3,-4,1,7怎么等于24?
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3,-4,1,7怎么等于24?
3,-4,1,7怎么等于24?

3,-4,1,7怎么等于24?
(1+3)×7+(-4)=24
3-[1+(-4)]×7=24
3×7-1-(-4)=24

(3+1)*7-4

3-(-4+1)*7=3-(-21)=24

(3+1)×7+(-4)=24

3+1=4
4*7=28
28+(-4)=24

3X7-(-4)-1
(3+1)X7-4

3*7-(-4)-1