Let the number of rows of seats in the classroom be m, expressed by the formula 1. There are 6 more seats in each row than in the classroom. How many seats are there in the classroom? 2. The number of rows of seats in the classroom is two-thirds of each row. How many seats are there for teachers?

1. Row M
Seats per row (M + 6)
So there are m (M + 6) seats
2. Row M
Seats per row m * 2 / 3
So it's m ^ 2 * 2 / 3

Let the number of rows of seats in the classroom be m, which is expressed by the formula. The number of rows of seats in the classroom is 2 / 3 of the seats in each row. How many seats are there in the classroom,
The number of rows of seats in the classroom is two-thirds of that in each row,

The number of rows of seats in the classroom is 2 / 3 of that in each row: the number of rows = the number of seats in each row * 2 / 3
Seats per row: M / (2 / 3) = 3m / 2
There are total seats in the classroom: 3m / 2 * m = 3M & # / 2

In unit price, quantity and total price, when () is fixed, () and () are in positive proportion

When the unit price is fixed, the quantity and total price are in direct proportion; when the quantity is fixed, the unit price and total price are in direct proportion

Unit price, total price and quantity. When the unit price is fixed, the total price and quantity are equal When the total price is fixed, the unit price is proportional to the quantity When the quantity is fixed, the unit price and the total price are equal__ Proportion

① Because: total price △ quantity = unit price (definite), that is, the quotient of total price and quantity is definite, which conforms to the meaning of positive proportion, so the total price and quantity are in positive proportion; because: unit price × quantity = total price (definite), that is, the product of unit price and quantity is definite, which conforms to the meaning of inverse proportion, so the unit price and quantity are in inverse proportion

Let the number of rows of seats in the classroom be m, expressed by the formula 1. There are 6 more seats in each row than in the classroom. How many seats are there in the classroom? 2. The number of rows of seats in the classroom is two-thirds of each row. How many seats are there for teachers?