3.5-0.4x=1.7x2

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3.5-0.4x=1.7x23.5-0.4x=1.7x23.5-0.4x=1.7x2-0.4x=3.4-3.50.4x=0.1x=0.251.7x2啥意思？3.5-0.4X=3.4-0.4X=3.4-

3.5-0.4x=1.7x2
3.5-0.4x=1.7x2

3.5-0.4x=1.7x2
-0.4x=3.4-3.5
0.4x=0.1
x=0.25

1.7x2 啥意思？

3.5-0.4X=3.4
-0.4X=3.4-3.5
-0.4X=-0.1
X=4/1

3.5-0.4x=1.7x2 5(x2-x)=3(x2+x) 7/x2+x+1/x2-x=6/x2-1 3.5x+1/2x2=30 0.4x-8.5 x2 1、3.5X-14.5=3.X2、0.2（3-X）=0.4（6-X） x2+x=6, y=x2(x A={x｜x2 y=x2(x x2-3x+1=0 x2/(x4-x2+1) x2-5x+1=0则x2+x2/1 x2-3x-1=0,求①x2 1/x2;②x2-1/x2 (0.4-x)x2=0.4x(1+50%) y=x+√(1-x2) y2=x2+(1-x2)+2x√(1-x2) 解方程 2/(x2-x)+6/(1-x2)=7/(x2+x)x2为的平方解方程：X2--1/8(X2+2X)+X2+2X/3(X2--1)=11 解方程:(x2-3x+2)(x2+3x-2)=x2(x+3)(x-3)