Solve equation 4.6 times 3 divided by 0.7x = 29.9 It's urgent

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• 1. Solve the equation 8x + 4 = 2 (4x + 3) - 2 (- 3 + x)
• 2. There are three numbers in an equal ratio sequence, and the sum is 21. If the third number subtracts 9, then the three numbers will become an equal difference sequence, and the three numbers can be calculated I figured out that the middle number was four,
• 3. It is known that the coordinates of vertex A and B of square ABCD are a (1,0), B (5,3) respectively, and point D is in the second quadrant
• 4. Let a be a square matrix of order n, and the square of a = e (or identity matrix), then why should all eigenvalues of a be justified
• 5. How to get adjacency matrix from incidence matrix of graph
• 6. 7 to the power of 24 - 1 can be divided by two numbers between 30 and 40
• 7. The transformation of [M2 + (√ 2) N2] / [M1 + (√ 2) N1] forms a + √ 2B
• 8. In the case of TP, V1 / V2 = N1 / N2 = N1 / N2, and in the case of TP, density 1 / density 2 = M1 / m2 are both correct
• 9. 1.M=m/n 2. D = m / M (a) d is the relative density 3. M / M (a) = what / ρ (a) Help me to explain the meaning of 1 and 2, and can 1 be used to calculate the relative molecular mass of gas and solid? What is density or P in 3 T. P same: V1 / V2 = N1 / N2 (= N1 / N2)
• 10. The origin of V1: V2 = N1: N2
• 11. When Xiao Ming solved the equation 2x − 15 + 1 = x + A2, due to carelessness, when the denominator is removed, the left 1 of the equation is not multiplied by 10, so the solution obtained is x = 4. Try to find the value of a, and correctly find the solution of the equation
• 12. 119 points 108 + 119 points 11 * 120 simple operation
• 13. How many days is 321 hours
• 14. The circumference of an isosceles triangle is 70 cm. The ratio of the length of a waist to the length of its bottom is 3:4. How many cm is the bottom of the triangle?
• 15. The constant term of polynomial 3x ^ 2-5y is The problem is that the coefficient of the first order term of the polynomial 3x ^ 2-5y is, and the constant term is
• 16. It is known that 248-1 can be divided by some two integers between 60 and 70, then the two numbers are () A. 61，62B. 61，63C. 63，65D. 65，67
• 17. If matrix AB = 0, then the relation between matrix A and matrix B Determinant a = 0, B = 0,
• 18. It is proved that (1) B + e is an invertible matrix (2) (B + e) ^ (- 1) = 1 / 2 (a + b)` The second question is (B + e) ^ (- 1) = 1 / 2 (a + e)
• 19. Given the relative vertices a (0, - 1) and C (2,5) of square ABCD, the coordinates of vertices B and D are obtained
• 20. There are four numbers, the first three numbers are equal proportion series, the last three numbers are equal difference series, the sum of the first and last two terms is 21, and the middle two terms If it is a / Q, a, AQ, a (2q-1), how to solve it,