谁知道?

2025-02-23 21:19:15
推荐回答(1个)
回答1:

(45+35)*15/2+45*14/2
=80*15/2+630/2
=1200/2+315
=600+315
=915(cm2)
14*7+(8+14)*6/2
=98+22*3
=98+66
=164(cm2)
5*3.6-5*1.4/2
=18-7/2
=18-3.5
=14.5
20*16-(3+9)*5/2
=320-12*5/2
=320-60/2
=320-30
=290
(12-6)*8/2
=6*4
=24(dm2)
8*10/2
=8