ab是有理数a*b=2a-3b求【(x-y)*(x+y)】*x的值
问题描述:
ab是有理数a*b=2a-3b求【(x-y)*(x+y)】*x的值
答
【(x-y)*(x+y)】*x=[2(x-y)-3(x+y)]*x=(-x-5y)*x=2(-x-5y)-3x=-2x-10y-3x=-5x-10y
ab是有理数a*b=2a-3b求【(x-y)*(x+y)】*x的值
【(x-y)*(x+y)】*x=[2(x-y)-3(x+y)]*x=(-x-5y)*x=2(-x-5y)-3x=-2x-10y-3x=-5x-10y