8.7×10.1得简便法

2024-10-30 14:08:51
推荐回答(2个)
回答(1):


回答(2):

(9-0.3)*(10+0.1)
=9*10+9*0.1-0.3*10-0.3*0.1
=90+0.9-3-0.03
=87.87