88点8×8点7 11点2×9点9-1点2×1点二简便计算

2025-04-08 21:05:37
推荐回答(1个)
回答1:

简便计算
88.8×8.7+ 1.2×9.9-1.2×1.2
=88.8×8.7+ 1.2×(9.9-1.2)
=88.8×8.7+ 1.2×8.7
=(88.8+1.2)×8.7
=90×8.7
=783