已知f(x)=x2+1,则f(3x+2)=______.
∵f(x)=x2+1,
∴f(3x+2)=(3x+2)2+1=9x2+12x+5.
故答案为:9x2+12x+5.
按给出的要求变换下列句子,要求每空限填一词。
1. This is a watch. (变为复数形式)
__________ are some __________.
2. Can Cindy sing this song in Chinese?(作肯定回答)
__________, __________ can.
3. This sweater is $28. (对划线部分提问)
_________ __________ is this sweater?
4. He does his homework in the evening. (改为否定句)
He __________ __________ his homework in the evening.
5. Tile biology class isn't boring. (改为同一句)
The biology class __________ __________.
电力缆线是为园林中照明、动力用电所设的电力线或电力缆线,不包括()
A、高压电力线
B、中压电力线
C、中高压电力线
D、低压电力线