It is known that the two roots of the equation x-7x + 12 = 0 are the two right sides of a right triangle. To find the area of the right triangle (detailed process)

The original formula = (x-3) (x-4), so x is equal to three or four, and the area of a right triangle is six

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1. The two right sides of a right triangle are the roots of the equation x ^ 2-7x + 12 = 0, and the area of a right triangle is calculated~
2. Given that the lengths of two sides of a right triangle are two of the equations X & # 178; - 7x + 12 = 0, the area of the triangle can be obtained
3. It is known that the lengths of the two sides of a right triangle are the two roots of the quadratic equation x & # 178; - 7x + 12 = 0, and the third length of the right triangle is obtained
4. Given that the lengths of two sides of a right triangle are exactly two of the equation x ^ 2-7x + 12 = 0, then the area of the right triangle is?
5. The 30 percent of x minus half of the difference is equal to the 20 percent of x plus 6, and the equation is given
6. Half of the difference between 30 percent of a minus 4 equals 20 percent of a plus 6
7. Half of the difference between 20% of X and 15 is - 2
8. Make the equation according to the following condition: half of the difference between 20% of a number and 15 equals 2
9. Two times the difference between a number and 1 is equal to the sum of this number and 5. Let this number be x, then the equation is obtained______ ．
10. X-30.5 = 3.4x how much is x equal to
11. If the third power of a is equal to the sixth power of - 8x and the ninth power of Y, what is a =? Come on
12. If the equation x + 2Y = - 1,2x-y = 3, kx-y = 9, find the value of K
13. When x = - 0.5, the bivariate linear equation 2x-y = 3 has the same solution as KX + 2Y = - 1? Emergency
14. Three bivariate linear equations 2x + 5y-6 = 0,3x-2y-9 = 0, y = kx-9 have common solutions if k =? There is a detailed process thank you
15. If the equation x + 2Y = - 4, 2x-y = 7, y-kx + 9 = 0 has a common solution, then the value of K is
16. Given that the system of equations (1) 4x + 3Y = 12, (2) X -- 3 / 2Y = 12 and equation y = kx-1 have a common solution, then K=
17. Given that the system of equations X / 3, Y / 4 = 2, kx-2y = 3 and equation 2x-y = have a common solution, find the value of K
18. If x = - 1y = - 3 is a solution of the equation KX + 2Y = 7, then k = ()
19. Given that x = 5Y = 7 is the solution of the equation kx-2y-1 = 0, then K=______ ．
20. It is known that x = 5, y = 7 are solutions of the equation kx-2y-1 = O, then K=