Mathematical calculation problem: (- 1 and 1 / 2) - 1 and 1 / 4 + (- 2 and 1 / 2) - (- 3 and 3 / 4) - (- 1 and 1 / 4) + 4 =? |-2 and 1 / 2 | + (- 3.7) + | - (+ 2.7) | - - (7 and 1 / 2) | =?

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• 1. In triangle ABC, the area of triangle ABC is 90, C = 5cm, a: B = 2:3?
• 2. In RT angle ABC, the opposite sides of ∠ C = 90 ∠ a ∠ B ∠ C are a, B, C (1) if a = 3cm, B = 5cm, then C = (2) if a is more than B = 3 than 4, and C = 10cm, then a = B As long as the answer is no picture
• 3. In △ ABC, ∠ A: B: C = 1:1:2, then ∠ C = 90 ° if CD is an angular bisector and CD = 5cm, then ab=
• 4. If AC = 2.4cm, BC = 1.5cm, then the area of △ AEC is______ ．
• 5. In △ ABC, ∠ C = 90 ° (1) known C = 8 √ 3, ∠ a = 60 °, find ∠ B, a, B (2) known a = 3 √ 6, ∠ a = 30 °, find ∠ B, B, C That "√" is the root
• 6. Given that the three internal angles of △ ABC satisfy the relation ∠ B + ∠ C = 2 ∠ a, then ∠ a = (). A.30 ° b.45 ° c.60 ° d.90 °
• 7. Given the triangle ABC, a = 1, B = root 3, C = 30 degrees, find a = how many degrees, a = 90, B = 45, C = 30, d = 60
• 8. If △ ABC is known, ∠ C = 90, the right triangle can be solved under the following conditions: 1. If a = 20, C = 20, root sign 2, find ∠ B 2. If C = 30, a = 60, find a 3. Given B = 15. A = 30, find a
• 9. In triangle ABC, if (a + B + C) (B + C-A) = 3bC, then angle a is
• 10. In △ ABC, the edges of angles a, B and C are a, B and C respectively, and (a + B + C) (B + C-A) = 3bC. (1) find the degree of angle a; (2) if 2B = 3C, find the value of Tanc
• 11. How to solve the equation (X-2) * 75 = (x + 5) * 60
• 12. 1. Find out the angle a (0 ° ≤ a < 360 °) where the end edges of the following angles coincide, and judge which quadrant the following angles are （1）-1441°（2）1790° 2. Fill in the blanks (1) The set of the first quadrant angles is: (2) The set of angles of the end edge on the coordinate axis is:
• 13. How to solve the equation 4 / 1 = Y-10 / x + 8 - y + 32 / x + 18 The column above is wrong -1. Wrong The original problem is: a fraction, such as numerator plus 8, denominator minus 10, the simplified value is equal to 4 / 3; such as numerator plus 18, denominator plus 32, the simplified ﹛ x-10/y+8=4/3 The value after is equal to 2 / 1, and this fraction is (hint: let the fraction be x / Y {to solve this equation ﹛ x+32/y+18=2/1
• 14. How much is 4.3 plus 3.7?
• 15. A problem of number axis and linear equation Find out the linear equation of triangle area 12 which is the intersection of two lines x-2y + 8 = 0 and 3x + 2Y = 0 and cut with the negative half axis of X axis and positive half axis of Y axis
• 16. Why is a nonempty subset obtained in this way = 2 ^ n-1? (n represents the number of subsets)
• 17. The intersection coordinates of the inverse scale function and the positive scale function If there is an intersection (m, n) between the positive scale function y + K1X (K1 ≠ 0) and the inverse scale function y = K2 / X (x ≠ 0), then the coordinates of the other intersection are (,) 2. In the same coordinate system, make the image of function y = 2 / X and function y = X-1, y = X-1, and use the image to find their intersection coordinates
• 18. Simple algorithm of 36 + 18 × 37 + 19 × 36
• 19. Find the image of function y = x square + 1 / X (x is not equal to 0) Teach me the method
• 20. When m is the value, the quadratic equation MX2 + (m-1) x + M = 0 (1) If the solution set of the inequality MX2 + (m-1) x + m > 0 is r, the value range of M is obtained I think there is something wrong with the title.