若aΔb=a+b/axb,那么,2Δ(3Δ4)的结果是多少?

问题描述:

若aΔb=a+b/axb,那么,2Δ(3Δ4)的结果是多少?

aΔb=a+b/axb应该是aΔb=(a+b)/(axb)的意思吧?
如果是,则
3Δ4 = (3+4)/(3x4)=7/12;
2Δ(3Δ4)
= 2Δ(7/12)
= (2 + 7/12)/(2x(7/12))
= (31/12) / (7/6)
= 31/14

3Δ4=(3+4)/(3*4)=7/12
2Δ7/12=(2+7/12)/(2*7/12)=(31/12)/(14/12)=31/14
2Δ(3Δ4)=31/14

aΔb=a+b/axb应该是aΔb=(a+b)/(axb)的意思吧?!
这样的话,则
3Δ4 = (3+4)/(3x4)=7/12;
2Δ(3Δ4)
= 2Δ(7/12)
= (2 + 7/12)/(2x(7/12))
= (31/12) / (7/6)
= 31/14

3Δ4=(3+4)/(3×4)=7/12
2Δ(3Δ4)
=2Δ7/12
=(2+7/12)/(2×7/12)
=31/14