第一题 X1=1 X2=2 X3=1
｛2X1-X2+3X3=33X1+X2-5X3=04X1-X2+X3=3X1+3X2-13X3=-6{X1-2X2+3X
3个回答
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x1+5x2-x3-x4=-1x1-2x2+x3+3x4=33x1+8x2-x3+x4=1
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1x2=1|3(1x2x3-0x1x2) 2x3=1|3(2x3x4-1x2x3) 3x4=1|3(3x4x5-2x3x
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1x2=1/3(1x2x3=0x1x2 ) 2x3=1/3(2x3x4-1x2x3) 3x4=1/3(3x4x5- 2x
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x1+5x2+2x3-4x4=3 -3x1-2x2+3x3+4x4=-6 -x1+3x2-x3-4x4=-2 -2x1+
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解线性方程组{x1+2x2+x3=10,2x1+5x2+3x3=20,x1+x2+3x3=13}
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6-3(x+2/3)+2/3 -x=-2/5x+1 2x-1/3=-x/3+2
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1.若x>5时,化简|x-5|-|2x-13| 2.|3x-2|+|2x+3| 3.||x-1|-3|+|3x+1|
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(x-1)/3-x/2=1 1-(2x)-1/5=x/3 (x-1)/2+1=x/3 2/3-8x=3-(1/2)x
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1X2=1/3（1X2X3-0X1X2) 2X3=1/3(2X3X4-1X2X3) 发现1X2+2X3+3X4+、、、、
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(x-3)/2-(2x+1)/3=1 x-(3-2x)/2=1-(x+2)/6 (3x+1)/12-(1-5x)/8=1