a,b为任意有理数,a*b=(a+b)-(a-b),求4*(-5)的值
问题描述:
a,b为任意有理数,a*b=(a+b)-(a-b),求4*(-5)的值
答
4*(-5)=[4+(-5)]-[4-(-5)]=-10
a,b为任意有理数,a*b=(a+b)-(a-b),求4*(-5)的值
4*(-5)=[4+(-5)]-[4-(-5)]=-10