what is three hundred and sixty-eight plus three hundred and twenty-one

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1. Five sixths plus five eighths in X brackets is seven sixties
2. When Xiao Ming solved the equation 2x-1 / 5 + 1 = x + A / 2, due to carelessness, when the denominator was removed, the left 1 of the equation was not multiplied by 10, so the solution obtained was x = 4. Try to find the value of a, and correctly find the solution of the equation When Xiao Ming solved the equation 5 (2x-1) + 1 = 2 (x + a), due to carelessness, when removing the denominator, the 1 on the left side of the equation was not multiplied by 10, so the solution obtained was x = 4. Try to find the value of a and get the solution of the equation correctly.
3. Solving equation 7x + 5 = 8 [X-1]
4. Solve the equation 4x = 7 [22-x]
5. If the sum of the three positive numbers is 21, then the third number minus 9 will be an arithmetic sequence There are three positive numbers in an equal proportion sequence The sum is 21 If you subtract 9 from the third number Then they form an arithmetic sequence Find these three numbers
6. As shown in the figure, in ladder ABCD, ad is parallel to BC, angle B = 90, AB is perpendicular to BC, ad = 2, BC = 8, and point E is on line CD As shown in the figure, in ladder ABCD, AD / / BC, ∠ B = 90 ° ab ⊥ BC, ad = 2, BC = 8, and point E is on line CD If the trapezoid ABCD is folded along be, point C falls on point P of ray am 1. When point P and point a coincide, find the length of CD 2. Find the length of crease be in 1 3. Let PA = x, be = y, find the functional relationship between Y and X
7. Let the eigenvalues of matrix A of order 3 be the eigenvectors corresponding to 1,2, - 3, A1, A2 and A3 in turn. Let the square matrix B = a * - 2A + 3I, find the eigenvalues of B ^ - 1 and det (b ^ - 1) Please answer for me,
8. The relationship among similarity, congruence, equivalence and rank of matrix For example, if two matrices are equivalent, we can deduce the rank equality of these two matrices,
9. Given that m and N are positive integers and M + 3N can be divisible by 11, can m + 3N + 5 be divisible by 11?
10. 1. A ^ 2B ^ 2-C ^ 2 + 2Ab + 12. X ^ 2Y ^ 2-4 + XY ^ 2-2y factorization
11. 20% x + 18% (x + 30) = 18.8% (x + X + 30) to solve the equation X is the unknown
12. The sum of the three numbers is 312, which can be divided by 7, 8 and 9 respectively, and the quotient is the same______ 、______ And______ ．
13. The circumference of an isosceles triangle is 50cm. The ratio of the waist to the bottom is 3:4
14. X minus three fourths x = 15 to solve the equation
15. X - three quarters x = two thirds
16. X - three quarters x = 60 × two thirds (solving the equation)
17. Solve the equation x - two thirds x equals three quarters
18. How to solve the equation: three fourths divided by x = three seventies
19. Given that a = 2x & # 178; + 3ax-2x-1, B = - X & # 178; + AX-1, and the value of 3A + 6B has nothing to do with X, find the value of A
20. It is known that a = 2x & # 178; + 3ax-2x-1, B = - X & # 178; + AX-1, and the value of 3A + 6B has nothing to do with X