2-4x 变形到 2x-1 要除 -2
2-4X———— >0 5+3X答:两边乘(3x+5)²>0所以(2-4x)(3x+5)>0两边除以-2(2x-1)(3
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相关问题
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3X-5+2X=4X-3 5X-2.2X=5乘3-1.2X1.2X+(X-3)+X=3.4(2+0.1X)乘8=4乘81
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2x-1-x/3=x+2/4-3 1/5(2x-1/3-4)=1 x-0.1/0.3-1.2=x+0.2/0.5 5x+
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X1 - X3 - X4 -5X5=0 X1+2X2+3X3+3X4+7X5=0 X1+X2+X3+X4+X5=0 X2
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1)4x2-12x-1=0 (2)3x2+2x-3=0 (3)5x2-4x-12=0 (4)3x(x+2)=5(x+2)
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1.(x+2)²-5=0 2.2x²-x-3=0 3.x²-6x-5=0 4.(x+3)&
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1.x^2-3x-18=0 2.x^2+3x-5=0 3.x^2-4x-7=0 4.3^2-6x-9=0 5.3x^2-
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:(X1+X2+X3)~N(0,3),:(X4+X5+X6)~N(0,3),所以 (1/3)*[(X1+X2+X3)^2
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5x-2=3x+4 两边_____,根据_____得_____=3x+6.两边_____,根据_____得2x=____
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解线性方程组 X1-X2+2X4+X5=0 3X1-3X2+7X4=0 X1-X2+2X3+3X4+2X5=0 2X1-