Giải giúp mk nha mk cần gấp

Giair giúp mk nha mk cần gấp

1) Cho hình thang ABCD có AB//CD, góc B- góc C=26*, góc A=1,5D. Tính các góc trong của hình thang

2) Cho hình thanh cân ABCD có AB//CD, AB<CD, các đường cao AH, BK

a) Chứng minh: CH=KD

b) Cho AB=6, CD=15. Tính CK, DH

5) D=(x-7)*(x+5)-(x-4)*(x+3)

6) E= 4x*(x²-x-1)-(x+3)*(x²-2)

7) F= 5x*(x-3)*(x-1)-4x*(x²-2x)

1) (x²-4x+16) (x+4)-x(x+1) (x+2)+3x²=0

2) (8x+2) (1-3x)+(6x-1) (4x-10)=-50

3) (x²+2x+4) (2-x)+x(x-3) (x+4)-x²+24=0

4) (\(\dfrac{x}{2}\)x2+3) (5-6x)+(12x-2) (\(\dfrac{x}{4}\)x4+3)=0

1) 5(x-3) (x-7)-(5x+1) (x-2)= -8

2) x(x+1) (x+2)-(x+4) (3x-5)= 84-5x

3) (9x²-5) (x+3)-3x²(3x+9)=(x-5) (x+4)-x(x-11)

4) (x²-4x+16) (x+4)-x(x+1) (x+2)+3x²=0

5) (8x+2) (1-3x)+(6x-1) (4x-10)=-50

6) (x²+2x+4) (2-x)+x(x-3) (x+4)-x²+24=0

7) (\(\dfrac{x}{2}\)+3) (5-6x)+(12x-2) (\(\dfrac{x}{4}\)+3)=0

1) (\(\dfrac{1}{2}\)x + 3)*(x²- 4x- 6)

2) (6x² -9x +15)*(\(\dfrac{2}{3}\)x+1)

3) (3x² -x+5)*(x³+5x-1)

4) (x-1)*(x+1)*(x-2)

5) D=(x-7)*(x+5)-(x-4)*(x+3)

6) E= 4x*(x²-x-1)-(x+3)*(x²-2)

7) F= 5x*(x-3)*(x-1)-4x*(x²-2x)