T1: when m is the value, the two real number roots of equation 3 (x-1) (x-m) - (7-m ^ 2) x = 0 are opposite to each other T2: there is an attempt to transport 36 tons of salt to the mainland. If you hire a number of trucks of type A that are just full, you can rent one less truck of type B, and the last one is still 4 tons short of full. It is known that each truck of type A is 2 tons more than that of type B. what is the carrying capacity of each truck of type A and type B T3: a drugstore decided to reduce the price of drugs. After two consecutive price cuts, a certain drug was reduced from 200 yuan to 128 yuan per box First question: what's the percentage of price reduction for this kind of medicine? The second question: according to the survey, the price of each box of medicine is reduced by 5%, and 10 more boxes can be sold. If 500 boxes can be sold every day, how many boxes can be sold every month after two price adjustments? In the second question, car a carries 2 tons less than car B It's wrong

T1: when m is the value, the two real number roots of equation 3 (x-1) (x-m) - (7-m ^ 2) x = 0 are opposite to each other T2: there is an attempt to transport 36 tons of salt to the mainland. If you hire a number of trucks of type A that are just full, you can rent one less truck of type B, and the last one is still 4 tons short of full. It is known that each truck of type A is 2 tons more than that of type B. what is the carrying capacity of each truck of type A and type B T3: a drugstore decided to reduce the price of drugs. After two consecutive price cuts, a certain drug was reduced from 200 yuan to 128 yuan per box First question: what's the percentage of price reduction for this kind of medicine? The second question: according to the survey, the price of each box of medicine is reduced by 5%, and 10 more boxes can be sold. If 500 boxes can be sold every day, how many boxes can be sold every month after two price adjustments? In the second question, car a carries 2 tons less than car B It's wrong

1, which means that the coefficient of X is 0
That is, m ^ 2-3m-10 = 0, M = 5 or - 2
Two
Suppose that the loading capacity of a is x tons and Y vehicles are needed, and that of B is x + 2 and Y-1
Then 36 = XY
xy=（x+2）（y-1）-4
The solution is x = 6, y = 6
So 6 tons for a and 8 tons for B
3. (1) let x decrease every time, then (1-x) ^ 2 = 128 / 200
x=20%
(2) Now price reduction (200-128) / 200 * 100% = 36%
More sales 36% / 5% * 10 = 72 boxes
Do you want to sell 10 more boxes per day or every month after the price reduction
On a daily basis, it is
Now daily sales 500 + 72 = 572
Monthly sales 572 * 30 = 17160 boxes
As shown in the figure, in RT △ BDE, the radius of the circumscribed circle of ∠ BDE = 90 ° BC bisection ∠ DBE intersects de at point C, AC ⊥ CB intersects be at point a, and △ ABC is R. (1) if ∠ e = 30 °, prove: BC · BD = R · ed; (2) if BD = 3, de = 4, find the length of AE
(1) It is proved that: take the midpoint o of AB, where △ ABC is RT △ and ab is the hypotenuse, where o is the center of the circumscribed circle, and connect Co, Bo = Co, BCO = OBC, BC is the bisector of DBE, DBC = CBA, OCB = DBC, OC ‖ DB, and ocbd = cede E=30°，∴∠DBE=60°，∴∠CBE=12∠DBE=30°，∴∠CBE=∠E，∴CE=BC，∴BC•BD=r•ED．（2） BD = 3, de = 4, according to Pythagorean theorem, be = 5, let the radius length of the circle be r, then OC = OA = R, ∵ OC ∥ dB, ∵ OCE