1. A batch of coal used 1/3 for the first time and 300 tons for the second time. At this time, the weight ratio of the remaining coal to the quantity used is 2: 3. How many tons of coal are left in this batch?

Fill in the blanks:

1, cuboid warehouse 1, 50 meters long, 30 meters wide and 5 meters high. This cuboid warehouse can hold up to 8 cubic meters of cuboid containers ().

2. There is a 20-cm-long iron wire to enclose a quadrilateral with opposite sides of 4 cm. This quadrilateral may be ().

Multiple choice question:

1, the natural number A divided by the natural number B, and the quotient is 10, then the greatest common divisor of A and B is ().

a、a b、b c、 10

2. A triangle is divided into two triangles by drawing a line segment through one of its vertices, and the sum of the internal angles of a triangle is ().

A, 180 B, 90 C, uncertain, 1, how to calculate it? 2. I can't read the title clearly, 1,1:1125t.

2:750

3: Square

(1): the greatest common divisor is B.

(2): 180 degrees, 0,