题目

They usually go to see their grandparents ______ Sundays. A . of B . in C . on D . at 答案：C若新规定这样一种运算法则：a※b=a2+2ab，例如：3※（-2）=32+2×3×（-2）=-3．（1）试求（-2）※3的值；（2）若（-2）※x=-2+x，求x的值．