7分之5减9分之5乘7分之5 简便
问题描述:
7分之5减9分之5乘7分之5 简便
答
=7分之5×(1-9分之5)
=7分之5×9分之4
=63分之20
7分之5减9分之5乘7分之5 简便
=7分之5×(1-9分之5)
=7分之5×9分之4
=63分之20