How many combinations of 123456 numbers

6! 720 kinds

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1. Square root of 0,3, square root of 6, square root of 3,12, square root of 15, square root of 18, find the law What's the tenth number?
2. If two of the equations X & # 178; + (M & # 178; - 1) x + M = 0 are opposite to each other, then the value of M is
3. (3x + 5) (- 3x + 5) - x (7x + 8) (7x-8) - (8x) where x = - 2
4. The number of six digits is () A. 40B. 60C. 80D. 10
5. Given that a is the integral part of √ 170 and B-1 is the square root of 400, find √ a + B
6. We know the equation x2 + (M + 2) x + 2m-1 = 0 about X. (1) prove that the equation has two unequal real roots. (2) when m is the value, the two roots of the equation are opposite to each other? The solution of the equation is obtained
7. How to solve 8 + 0.7x = 18-3.3x equation
8. The number of six digits is () A. 40B. 60C. 80D. 10
9. There is a passage in the eighth grade mathematics textbook: the square root of the positive number a can be represented by √ a, and the negative square root of the positive number a can be represented by - √ a There is a note beside it saying that the symbol √ A is meaningful only when a ≥ 0, but not when a is less than zero. Why
10. It is known that the equation M & # 178; X & # 178; + (2m + 3) x + 1 = 0 about X has two reciprocal roots, so we can find the value of real number M
11. Write an algorithm for solving the equations {3x-2y = - 27x-y = 18}?
12. It is known that the equation of X, two-thirds x-m = x + three-thirds m and two-thirds x + 1 = 3x-2 are reciprocal to each other, and the value of M is obtained
13. 3x + 20% x = 16 10% x + 30% = 3.2 how to write these two equations? 3x+20％x=16 10％x+30％=3.2
14. How to solve complex equations, such as: 3 (3x-2) = 10-0.5 (x + 3.5)
15. How to solve the equation 5 (X -- 10) = 3x -- 6
16. How to solve this equation
17. Solve the following equation 1. X ^ 2-3x-10 = 0.2. (x + 3) (x-1) = 5 Solve the following equation 1.x^2-3x-10=0 2.(x+3)(x-1)=5 Because can't think out headache. Need to know why become like that, not to know the answer behind, otherwise the exam won't do it
18. 1. Calculation (1) (0.25x-1 / 4) (0.25x + 0.25) (2) (- 7x ^ 3y-3b ^ 2 (7x ^ y-3b ^ 2) (3) (3x-y) (3x + y) 1. Calculation (1) (0.25x-1 / 4) (0.25x + 0.25) (2) (- 7x ^ 3y-3b ^ 2 (7x ^ y-3b ^ 2) (3) (3x-y) (3x + y) + y (x + y) (4) (X-2) (16 + x ^ 4) (2 + x) (4 + x ^ 2) 2. Simple calculation (1) 40 and 2 / 3 × 39 and 1 / 3 (2) 3 × 5 × 17 × (2 ^ 8 + 1)
19. It is known that the equation 9x-3 = KX + 14 about X has integer solution. Find the value of all integers K satisfying the condition
20. It is known that the equation 9x-3 = KX + 14 about X has integer solution. Find the value of all integers K satisfying the condition