“99*99=( )”“88-252/(72/4)=( )的简便方法是什么?
问题描述:
“99*99=( )”“88-252/(72/4)=( )的简便方法是什么?
答
88-252÷(72÷4)
=88-252÷18
=88-(9×28)÷(9×2)
=88-28÷2
=88-14
=74