B:He ____ to to Beijing ____ ____.
(1)-6+π-3.140+-13-1(2)-2ab22·3a2b-2ab-1(3)a-1a2+1a+1(4)2a+2b-32a-2b+3
根据题意,补全对话。
— Are the vegetables healthy?
—____ .(做肯定回答)
{2x−7<3(x−1)①5−12(x+4)≥x②