请问这道题怎么谢谢

2025-01-05 14:43:19
推荐回答(3个)
回答(1):

原式
=290-3+290-2+290-1+290+290+1+290+2+290+3
=290+290+290+290+290+290+290
=290*7
=2030

回答(2):

290x7=2030

回答(3):

=290-3+290-2+290-1+290+290+1+290+2+290+3
=290*7
=2330