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2x-y-3=0 x-2y+3=0 2x+y+5=0 x+2y-5=0
3a+2b=5ab 5y﹣3y=2 3x2y﹣2yx2=x2y ﹣3x+5x=﹣8x
2x>3y>5z 3y>5z>2x 3y>2x>5z 2x>5z>3y
x+2y-5=0 x+2y+5=0 2x-y=0或x+2y-5=0 2x-y=0或x-2y+3=0
-3x2y·5x2y=2x2y -2x2y3·2x3y=-2x5y4 35x3y2÷5x2y=7xy (-2x-y)(2x+y)=4x2-y2
3x-2y = 0 x + y-5 = 0 2x-3y = 0 或x + y-5 = 0 3x-2y = 0 或x + y-5 = 0
3x-y-5=0 3x+y-7=0 3x-y-1=0 3x+y-5=0
x=3,y=2 x=2,y=3 x=0,y=5 x=5,y=0
3x2y﹣2x2y=x2y 5y﹣3y=2 ﹣3x+5x=﹣8x 3a+2b=5ab
如果2x=2y+1,那么x=y+1 如果2=5+3x,那么3x=5﹣2 如果x﹣3=y﹣3,那么x=y 如果﹣8x=4,那么x=﹣2
y=x3-2B y=2x3-5 y=x2-2D y=2x2-5
y=5 (x+2) 2-3 y=5 (x+2)2+3 y=5 (x-2) 2-3 y=5 (x-2) 2+3
2x<3y<5z 3y<2x<5z 5z<3y<2x 5z<2x<3y
x2+x2=x4 3x3y2﹣2x3y2=1 4x2y3+5x3y2=9x5y5 5x2y4﹣3x2y4=2x2y4
x+2; x-12y+2; -5x+12y+2; 2-5x.
5x﹣(x﹣2y)=5x﹣x+2y 2a2+(3a﹣b)=2a2+3a﹣b (x﹣2y)﹣(x2﹣y2)=x﹣2y﹣x2+y2 3x2﹣3(x+6)=3x2﹣3x﹣6
y=3x-1 y=-3x+5 y=3x+5 y=2x