English words I may copy a wrong word, please help me guess what word it may be! (miles is not found) of Americans have recently taken an interest in the bilyle as if it were a new invention

Millions means millions

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1. In the following functions, () is the original function of xcosx a:－xsinx－cosx b:－xsinx+cosx c:xsinx+cosx d:xsinx－cosx
2. Water freezes and its mass (constant, smaller, larger)
3. The meaning of COS sin Tan in Mathematics Junior high school class sleep.. did not pay attention to
4. Must the approximately equal sign be used for rounding? In junior high school about equal sign can be used for into one, give up
5. The fifth power of (a + b) and the third power of (B + a)=
6. What's 10 times 3 / 5?
7. The function f (x) = x ^ 2 + ax + 3 when a belongs to [- 2,2], f (x) > = a is constant, and the value range of X is obtained~
8. The quotient is 14 and the remainder is 6
9. Finding the general solution of differential equation of x power of Y '- y = e
10. Minus five and eighteen five times minus thirty-six plus seventy-one and sixteen fifteen
11. General solution of differential equation y'cosx + ysinx = 1
12. How does Chinese affect English words?
13. Calculation: 19492-19502 + 19512-19522 + +19972-19982+19992=______ ．
14. Ready to leave after dinner?
15. As shown in the figure, in the isosceles △ ABC, ab = AC, ∠ BAC = 120 °, ad is the height on the edge of BC, passing through point d to make de ‖ AB, intersecting AC at point E. in addition to △ ABC, is there any isosceles triangle in the figure? If yes, please point out and give reasons
16. It is known that: as shown in the figure, in △ ABC, ∠ BAC = 120 ° AB = AC, the vertical bisector on the side of AB intersects BC at point D, intersects AB at point E, and connects ad, Verification: CD = 2bd
17. As shown in the figure, D is any point on the bottom edge BC of the isosceles triangle ABC, take a point E, AE = ad on the ray AC, and verify the angle bad = 2 EDC
18. If P is a point outside the plane where △ ABC is located and the lines AP, BP and CP are perpendicular, then the projection of P on plane ABC is ()
19. It is known that △ ABC is inscribed in ⊙ o, and ab is the diameter of ⊙ O. the bisector of ∠ ACB intersects ⊙ o at point D. if AB = 2cm, then ad=______ cm．
20. It is known that: as shown in the figure, △ ABC is the inscribed triangle of ⊙ o, ⊙ O's diameter BD intersects AC at e, AF ⊥ BD at F, extending AF intersects BC at g. the proof is AB2 = BG · BC