1 and 2 are represented by scientific notation, 3, 4, 5 are calculated and the results are represented by scientific notation (1)20X50= (2) 2 to the 10th power multiplied by 5 to the 11th power= (3) (1.2 × 10 to the fifth power) × (5 × 10 to the square)= (4) The square of 25 is the fourth power of 4= (5) The square of 3 × the sixth power of 2 × the eighth power of 5=

(1) The third power of 10
(2) The 10th power of 5 * 10
(3) The 7th power of 6 * 10
(4) The fifth power of 1.6 * 10
(5) The eighth power of 2.25 * 10
*It means multiply sign

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1. 17 cm = () m, using scientific notation, using a simpler method
2. Planning cost method, material cost variance rate calculation Suppose a company has 10 tons of materials in stock at the beginning of the period, the planned cost is 17800 yuan, and the material cost difference is 250 yuan; the total cost of purchasing 10 tons of materials this month is 17600 yuan The difference rate of material cost in this month is as follows: (250-200)/(17800+17800)*100%=0.14% The above is an example Is the molecule (250-200) and why not (250 + 200)?
3. Look at the picture, find the rule, fill in the number at the question mark, why?
4. 1+2+2+3+3+3+4+4+4+4+.+100+100+100.
5. 1 + 2 + 3 +. + 100 = how much
6. (-1+1/2)*(-1+1/3).*(-1+1/100)
7. 500, 250, 166 and 2 / 3, (), 100, 83 and 1 / 3
8. 1,2 of 1,2 of 3,2, find the law
9. 1+2+3…… +99+100+99+…… +3 + 2 + 1 =? Find the law and work out the result
10. Observe the following formulas: 1 + 2 + 1 = 4, 1 + 2 + 3 + 2 + 1 = 9, 1 + 2 + 3 + 4 + 3 + 2 + 1 = 16, 1 + 2 + 3 + 4 + 5 + 4 + 3 + 2 + 1 = 25 According to the rule you found, please write the result of the following formula directly: 1 + 2 + 3 + +99+100+99+… +3+2+1=______ ．
11. Calculating 1024 * 1024 with scientific counting method
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13. What's the formula for compound interest? For example, if 100000 yuan is calculated at an annual rate of 12%, how much will it be after ten years?
14. A formula for calculating compound interest For example, suppose that the principal is 10000 and the monthly income is 10%. Add up the monthly income. That is to say, the principal in the second month is 11000. What is the total income after one year? What is the formula?
15. The following formulas can be calculated by the adjustment formula A.（x+1）(1+x) B.(1/2a+b)(b-1/2a) c.(-a+b)(a-b) d.(x^2-y)(x+y^2)
16. Successive difference formula Using the puncher to make the paper tape, there are ABCDEFG... Points. Let the distances of ab.bc.cd.de.ef.fg... In the paper tape be s1.s2.s3.s4.s5.s6 respectively, The time interval corresponding to two adjacent points is t. the velocity of the object at point a is va. according to the uniform velocity linear motion formula and the velocity formula, it is proved that the displacement difference of the object passing through in the continuous and equal time interval is a constant, and satisfies s2-s1 = 3-s2 = s4-s3 =... = at ＾ 2; The proof process is as follows (hint: s1.s2 is calculated by displacement formula first) It's at ^ 2
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18. Formula of internal difference method
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