9.9x54 9.9x45 9.9的简便计算?

2025-04-02 11:46:02
推荐回答(2个)
回答1:

9.9×54+9.9×45+9.9
=9.9×(54+45+1)
=9.9×100
=990

回答2:

9.9x54+ 9.9x45 +9.9
=9.9x(54+45+1)
=9.9x100
=990