1. If the degree ratio of the three inner angles of a triangle is 2:3:4, the corresponding outer angle ratio is _ _ _ _ _.
Answer: 7:6:5
2. One side of a given equilateral triangle is equal to 5cm, the other side is equal to 1 1cm, and the circumference is _ _ _ _ _ _ _ _.
Answer: 27 cm
3. If (2x+3y-4)+|3y-6|=0, then x = _ _ _ _ y = _ _ _ _ _.
Answer:-1; 2
4. A city is rebuilding the pavement of the sidewalk in the old city, preparing to lay colored floor tiles on the ground intensively. Some people put forward four shapes of floor tiles for design: ① regular triangle, ② regular quadrangle, ③ regular pentagon and ④ regular hexagon. The shape of the floor tile that cannot be densely paved is ().
(1)? ①; (B)？ ②; (3)? ③; (D)？ ④
Answer: C.
5, in the same plane, the possible positional relationship between two straight lines is (? )? .
A, parallel; B, intersection; C, parallel or intersecting; Parallel, crossing or perpendicular.
Answer: D.
6. The two sides of the two corners are parallel, one of which is 60 and the other is _ _ _ _ _.
Answer: 60 or 120.
7. Given that m+n=2 and mn=-2, the value of (1+m)( 1+n) is ().
Answer: 1.
8. It is known that two A-type vehicles and 1 B-type vehicles can transport 10 tons of goods at one time; With 1 Type A car full of goods and 2 Type B cars full of goods, it can transport 1 1 ton of goods at one time. A logistics company has 3 1 ton of goods, and plans to rent a car A and a car B at the same time, and each car is just full of goods. According to the above information, answer the following questions:
How many tons can (1) 1 A and 1 B cars hold at a time?
(2) How many car rental schemes can you help the logistics company design?
(3) If there is no rent of 65,438+000 yuan/trip for Type A car and 65,438+020 yuan/trip for Type B car, please choose the most economical car rental scheme and work out the lowest car rental fee.
Answer: (1) x = 3; Y=4(2) There are three kinds of * * * a= 1 and B = 7；; a=5，b = 4； A=9, b= 1 (3) When renting a type 1 vehicle, the rental fee is the least.
The above are the required questions in the second volume of Mathematics in Grade One, I hope I can help you.