1, one yuan for each math book, the whole class * * * bought 45 books, and one * * * spent () yuan.

2. It is known that the product of two factors is 1.26, where one factor is 0.6 and the other factor is ().

3, 6x+ through means ().

4. Two identical triangles can be spelled into one ().

5, a quadrilateral, if a group of opposite sides are parallel, it is () shape, if two groups of opposite sides are parallel, it is () shape.

6, 0.09292 ... can be abbreviated as (); 5.76476 ... can be abbreviated as ()

7.x×6 omits the multiplication sign and is written as ().

8. Make 15 flags, each flag is made of n meters of cloth, * * * is made of () meters of cloth, and when n = 0.2, it is made of () meters of cloth.

9. The product of A and B is a2-ab, A is a-b and B is ().

10, according to the invariant property of quotient, 10÷0.08=( )÷8.

Second, I will choose.

1, when the value of a is (), a2