7.5x0.4十2.5x12.5简便计算

2024-11-29 19:46:32
推荐回答(1个)
回答(1):

=2.5x(0.4x3)+2.5x12.5
=2.5x1.2+2.5x12.5
=(1.2+12.5)x2.5
=34.25