Take AC BC of △ ABC side as square respectively, AbfG and ACDE connect Ge. If the extension line of OA with o as the midpoint of EG intersects BC at h, explore the following problems: (1) s △ ABC = s △ AEG (2) BC = 2ao (3) ah ⊥ BC (4) connect FD. If M is the midpoint of FD, Mn ⊥ BC in N, try to explore BC = 2Mn

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1. Calculation (- 2000 6 / 5) + (- 1999 3 / 2) + 4000 4 / 3 + (- 1 2 / 1) fast
2. As shown in the figure, it is known that the numbers a, B and C corresponding to points a, B and C on the number axis are not 0, and C is the midpoint of ab. if [a + b] - [a-2c] + [b-2c] - [a + b-2c] =0, then the position of origin 0 is () A. On line AC, B. on line Ca, C. on line BC, D. on line CB Is the absolute value sign
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4. Buy a transformer for the electric welding machine, and turn the household electricity from 220 V to two-phase 380 v. how to calculate the power of the electric welding machine? Rated output current 300A, rated input voltage 380 / 220, rated frequency 50Hz, rated input capacity 21.6KVA, no-load voltage 60V, rated load duration rate 20%, rated load voltage 32, current regulation range 90-300, can you make a transformer only for welding machine? I don't know very much. What kind of transformer do you want to make? What are the specific parameters?
5. General division 1 / X & # 178; - 4 and X / 4-2x X / (x-1) & # 178; and 1 / X & # 178; - 1
6. Does the filament of an electric lamp change with temperature? Is the resistance large or small when it is just turned on?
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8. This problem is factorized by undetermined coefficient method? x^4-x^3-5x^2-6x-4 Let x ^ 4-x ^ 3-5X ^ 2-6x-4 = (x ^ 2 + ax + b) (x ^ 2 + CX + D) =x^4+(a+c)x^3+(ac+b+d)x^2+(ad+bc)x+bd It can be concluded that a+c=-1, ac+b+d=-5, ad+bc=-6, bd=-4． How to solve a B C
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13. Of all the natural numbers from 1 to 2006, how many times 72 are perfect squares? I know the answer is 31, but I don't know how to get the result
14. Known vector group I: A1, A2, A3; II: A1, A2, A3, A4; III:a1 If the rank of each vector group is R (I) = R (II) = 3, R (III) = 4, it is proved that vector group IV: A1, A2, A3, a5-a4 are linearly independent
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18. Multiple choice question x = 0 is a function y = arctan1 / X X = 0 is the function y = arctan1 / X A. Removable discontinuities B. Jump breakpoint C. Infinite discontinuity D. Oscillation discontinuity
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