Giải phương trình:
1. \(\frac{2x+3}{4}-\frac{5x+3}{6}=\frac{3-4x}{12}\)
2. \(\frac{3.\left(2x+1\right)}{4}-1=\frac{15x-1}{10}\)
3. \(\frac{2x-1}{5}-\frac{x-2}{3}=\frac{x+7}{15}\)
4. \(\frac{x+3}{2}-\frac{x-1}{3}=\frac{x+5}{6}+1\)
5. \(\frac{x-4}{5}-\frac{3x-2}{10}-x=\frac{2x-5}{3}-\frac{7x+2}{6}\)
6. \(\frac{\left(x+2\right)\left(x+10\right)}{3}-\frac{\left(x+4\right)\left(x+10\right)}{12}=\frac{\left(x-2\right)\left(x+4\right)}{4}\)
7. \(\frac{\left(x+2\right)^2}{8}-2\left(2x-1\right)=25+\frac{\left(x-2\right)^2}{8}\)
8.\(\frac{7x^2-14x-5}{5}=\frac{\left(2x+1\right)^2}{5}-\frac{\left(x-1\right)^2}{3}\)
9. \(\frac{\left(2x-3\right)\left(2x+3\right)}{8}=\frac{\left(x-4\right)^2}{6}+\frac{\left(x-2\right)^2}{3}\)
10. \(\frac{x+1}{35}+\frac{x+3}{33}=\frac{x+5}{31}+\frac{x+7}{29}\)
Câu 1: Tìm x
1. A = x2 + 4x - 2
2. B = 2x2 - 4x + 3
3. C = x2 + y2 - 4x + 2y + 5
Câu 2: Tìm giá trị lớn nhất:
1. A = -x2 + 6x +5
2. B = - 4x2 - 9y2 - 4x + 6y + 3
Câu 3: Tìm x, y:
1. x2 + y2 - 2x + 4y + 5 = 0
2. 5x2 + 9y2 - 12xy - 6x + 9 = 0
Câu 4: Tìm a và b biết:
a) A(x) = 2x3 + 7x2
B(x) = x2 + x - 1
b) A(x) = a . x3 + b . x - 24
B(x) = x2 + 4x + 3
c) A(x) = 6x4 - x3 + a . x2 + 4
B(x) = x2 - 4
Câu 5: Cho x = y + 1. CMR:
1. x3 - y3 - 3xy = 1
2. (x + y) (x2 + y2) ( x4 + y4) (x8 + y8) = x18 - 1y16
Phân tích đa thức thành nhân tử:
1. 3x3 - 4x2 - 13x -4
2. 6x3 + x2 + x + 1
3. 4x2 + 6x2 + 4x +1
4. x6 - 9x3 + 8
5. 4x4 +8
6. x4 +1
7. 64x4 + y4
8. x2 + x + 6
9. (x + 2) (x + 4) (x + 6) (x + 8) + 16
10. (x2 + x + 1) (x2 + x + 1) -12
HELP ME T^T