规定一种新运算*,规定a*b=2a-b.当A=2x^2-y^2,B=x^2+xy,C=2xy+y^2时求:(a*b)*c的值.
问题描述:
规定一种新运算*,规定a*b=2a-b.当A=2x^2-y^2,B=x^2+xy,C=2xy+y^2时求:(a*b)*c的值.
答
(a*b)*c=(2a-b)*c=4a-2b-c代入即可
规定一种新运算*,规定a*b=2a-b.当A=2x^2-y^2,B=x^2+xy,C=2xy+y^2时求:(a*b)*c的值.
(a*b)*c=(2a-b)*c=4a-2b-c代入即可