10x9-9x8+8x7-7x6+6x5-5x4+4x3-3x2+2x1奥数作业,请问大家怎么做,

10x9-9x8+8x7-7x6+6x5-5x4+4x3-3x2+2x1奥数作业,请问大家怎么做,谢谢!
2025-06-26 14:25:57
推荐回答(2个)
回答1:

=9*(10-8)+7*(8-6)~~~3*(4-2)+2
=9*2+7*2+5*2+3*2+2
=18+14+10+6+2
=50

回答2:

24