1: (5 × 13 + 7) ÷ 3。

2: ((5 × 13) + 7) ÷ 3。

3: (7 + 5 × 13) ÷ 3。

4: {7 + (-5 )× (- 13)} ÷ 3。

5: (7 + 13 × 5) ÷ 3。

6: (7 + ( 13 × 5)) ÷ 3。

7: ( 13 × 5 + 7) ÷ 3。

8: (( 13 × 5) + 7) ÷ 3。

2 1 point, as the name implies, is a mathematical game with a score of 24. Authentic 2 1 point is a formula composed of four cards randomly, so the number is 24.

The following is an exercise of using four numbers to form an expression with the number 24. You can't exchange the order of numbers, you can only add parentheses and operation symbols.

There are tricks to calculate the topic of 24 points:

(1) Four numbers add up to 24;

(2) 16+8,2 1+3;

(3)30-6,25-3,34- 10;

(4)3×8,4×6,2× 12;

(5)96÷4,72÷3。