a*b=5a-b,则(2*4)*12=奥数题怎么解?

2025-06-20 23:06:11
推荐回答(1个)
回答1:

14*(5*2),
=14*(5×5-4×2),
=14*(25-8),
=14*17,
=5×14-4×17,
=70-68,
=2;
故答案为:2.