12 33 2-+(X X)DXX 1Ị T= +X 1XX 1.DX46 4 2+ + +Ị + T= -X 1XX 4X 4X 1

1)

1

2

3

3

2

-+(x x)dxx 1

t= +x 1xx 1.dx

4

6

4

2

+ + +

+ t= -x 1xx 4x 4x 1