The numbers corresponding to points 3, 4, 5, 6 and 7 are 3, 6, 10, 15 and 21 respectively?
f(x)=1/2x²-1/2x
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- 1. Number 2, 7, 15, 26, 40. (n) what is the law, find out the algebraic formula
- 2. What's the rule of 3 6 9 14 21? What's the next number
- 3. 1 * 3 / 1 + 3 * 5 / 1 + 5 * 7 / 1 + 7 * 9 / 1 +... + 2003 * 2005 / 1?
- 4. Calculate the following formula 1-3 + 5-7 + 9-11 +2007-2008
- 5. Calculation (2 × 5 + 2) (4 × 7 + 2) (2004×2007+2)/(1×4+2)(3×6+2)…… (2005×2008+2)
- 6. Simplify the evaluation of negative half A-2 (a minus half B to the second power) - (minus three-thirds a minus one-third B to the second power) a = - 1, B = one-third B = two-thirds, not one-third. sent the wrong message. Hee hee hurry up
- 7. The sixth power of 4A × the sixth power of B-the sixth power of 8A × the sixth power of B
- 8. Use the rounding method to approximate the following numbers 003 56 (accurate to 0.0001) 566.123 5 (accurate to individual) 3.896 3 (accurate to 0.01) 0.057 1 (accurate to thousandth)
- 9. I would like to ask the next approximation and accurate number how they round to what place Take the approximate number, generally use the method of rounding, rounding to which place, say the approximate number is accurate Make sure who you are
- 10. Round off each of the following approximate numbers ① 6328 (accurate to 0.01) ② 372300 (accurate to thousands) ③ 003499 (two significant digits reserved)
- 11. (1)2x^2+3x(2)3x^2+4x=3(3)2x^2-5x+3=0(4)4x^2+25=20x
- 12. What is the square of 1 + 2 + 2 + 3 power of 2 + 4 power of 2 until 2009 power of 2?
- 13. The area of a rectangle is 9 / 10 square meters, and its length is 3 meters. What's its width
- 14. The area of a rectangle is 9 / 10 square meters. Its width is 3 / 5 meters. How many meters is its length?
- 15. Cube of (- 2) - 3 * [(square of - 4) + 2] - square of (- 3) divided by (- 9)
- 16. X + X to the negative first power = 4 find the square of X + X to the negative second power
- 17. It is known that the trilateral lengths a, B and C of △ ABC satisfy the square of (a-5) + (B-12) + (C-13) = 0. Try to judge the shape of △ ABC and make it clear
- 18. How many square decimeters is 21.04 square meters equal to
- 19. If the square of a + the square of B = 25, ab = 12, find the square of a + B, A-B, a-b Given that 1 / 2 of x-x = 2, find (1) the square of X + 1 / 2 of X (2) the fourth power of X + 1E of X (3) x + 1 / 2 of X
- 20. What process is two thirds x-half (x-three-thirds) = 1