1x2.5x34.5+2x2.5x34.5+3x2.5x34.5+4x2.5x34.5=

2025-04-08 15:43:10
推荐回答(1个)
回答1:

1x2.5x34.5+2x2.5x34.5+3x2.5x34.5+4x2.5x34.5
=(1+2+3+4)×2.5×34.5
=10×2.5×34.5
=25×34.5
=862.5