... x 2 +3x 3 =3, 3x 1 + x 2 − 5x 3 =0, 4x 1 − x 2 + x 4 =3, x 1 +3x 2 − 13x 3 = −6. (D S. x 1 =1,x 2 =2,x 3 =1) 27. 2x 1 − x 2 + x 3 − x 4 =1, 2x 1 − x 2 − 3x 4 =2, 3x 1 − x 3 + ... tr`ınh 1) x 1 +2x 2 +3x 3 =6, 2x 1 − x 2 + x 3 =2, 3x 1 − x 2 − 2x 3 =2. (4.7) 2) x 1 − 2x 2 +3x 3 − x 4 =6, 2x 1 +3x 2 − 4x 3 +4x 4 =7, 3x 1 + x 2 − 2x 3 − 2x 4 =9, x 1 − 3x 2 +7x 3 +6x 4 = −7. (4.8) Gia ’ i. ... x 1 =1,x 2 =2,x 3 = −2) 29. 2x 1 +3x 2 +4x 3 +3x 4 =0, 4x 1 +6x 2 +9x 3 +8x 4 = 3, 6x 1 +9x 2 +9x 3 +4x 4 =8. (D S. x 1 = 7 2 − 3x 2 2 , x 3 = −1, x 4 = −1, x 2 t`uy ´y) 30 . 3x 1 +3x 2 − 6x 3 −...
Ngày tải lên: 15/08/2013, 15:21
... 159 14. x 1 − 2x 2 +3x 3 − 4x 4 =2, 3x 1 +3x 2 − 5x 3 + x 4 = 3, −2x 1 + x 2 +2x 3 − 3x 4 =5, 3x 1 +3x 3 − 10x 4 =8. (D S. Hˆe . vˆo nghiˆe . m) 15. x 1 +2x 2 +3x 3 − 2x 4 =1, 2x 1 − ... 2x 3 − 3x 4 =2, 3x 1 +2x 2 − x 3 +2x 4 = −5, 2x 1 − 3x 2 +2x 3 + x 4 =11. (D S. x 1 = 2 3 , x 2 = − 43 18 , x 3 = 13 9 , x 4 = − 7 18 ) 16. x 1 +2x 2 − 3x 3 +5x 4 =1, x 1 +3x 2 − ... nghiˆe . m) 6. x 1 +2x 2 +3x 3 =14, 3x 1 +2x 2 + x 3 =10, x 1 + x 2 + x 3 =6, 2x 1 +3x 2 − x 3 =5, x 1 + x 2 =3. (D S. x 1 =1,x 2 =2,x 3 =3) 7. x 1 +3x 2 − 2x 3 + x 4 + x 5 =1, x 1 +3x 2 − x 3 +3x 4 +2x 5 =3, x 1 +3x 2 −...
Ngày tải lên: 23/10/2013, 18:15
Bài tập toán cao cấp tập 3 ppt
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Ngày tải lên: 18/03/2014, 22:20
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