第3个式子错了是-x²+3x-x-3=0,然后化简为x²-4x+3=0即(x-3)(x-1)=0,∴x1=3,x2=1
(1)x-3=x(x-3) x-3=x²-3x -x²+x-3x=3 -x²-2x=3
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2x(3+1)x(3x3+1)x(3x3x3x3+1)x(3x3x3x3x3x3x3x3+1)+1=?急 注:x是乘号,
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X^3-3X^2+4=0x^3-3x^2+4=x^3+1-3x^2+3=(x^+1)(x^2+x+1)-3(x-1)(x
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1x2=1|3(1x2x3-0x1x2) 2x3=1|3(2x3x4-1x2x3) 3x4=1|3(3x4x5-2x3x
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{2X1-X2+3X3=33X1+X2-5X3=04X1-X2+X3=3X1+3X2-13X3=-6{X1-2X2+3X
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1x2=1/3(1x2x3=0x1x2 ) 2x3=1/3(2x3x4-1x2x3) 3x4=1/3(3x4x5- 2x
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(2x-3)(2x+3) (3x-1)^2 (-2X)(3X^2-2X+1) (2X-3)(3X+2) (X-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-2)²=(2x-3)² x²-4x=0 3x(x+1)=3x+3 x²-2
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X3+3X+2X3-3X2-3X3+3X2+3X=12
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3x+7=4x+5,4x-6=-3+5x,2x+1-x=3-3x,3x-1=x,3x-2=5x-6,4x+5=3x+3-