Cao đẳng - Đại học
... x1=9,x 2 =2, x3 =2) 2. x1− 3x 2 − 4x3=4,2x1+ x 2 − 3x3= −1,3x1− 2x 2 + x3=11..(DS. x1 =2, x 2 = 2, x3=1)3.2x1+3x 2 − x3=4,x1+2x 2 +2x3=5,3x1+4x 2 − 5x3 =2. .(DS. ... x 2 +4x3+ x4− x5 =2, x1− 2x 2 − 2x3+3x5=0,4x 2 +3x3− 2x4+2x5 =2, 2x1− x3+3x4− 2x5= 2, 3x1+2x 2 − 5x4+3x5=3..(DS. x1= 2 5, x 2 = ... 911 23 −45 2 2 11 12 25 22 4h 2 − h1→ h 2 h3− 2h1→ h3−→−→1357910 −5 2 −11 −410 521 14 2 h3+ h 2 → h3−→−→1357910 −5 −2...