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3x(x2–4x+4) 3x (x–4)2 3x(x+2)(x–2) 3x (x–2)2
6x3+1 6x3﹣3 6x3﹣3x2 6x3+3x2
00000015 00000017 00000021 00000023
由﹣x=y,得x=2y 由3x﹣2=2x+2,得x=4 由2x﹣3=3x,得x=3 由3x﹣5=7,得3x=7﹣5
-1/3X4-1/3X5<=2/3 X4-X5<=-2 X4+X5+S=2 -1/3X4-1/3X5+S=-2/3
y=3x2+2x﹣5 y=3x2+2x﹣4 y=3x2+2x+3 y=3x2+2x+4
﹣2(3x﹣1)=﹣6x﹣1 ﹣2(3x﹣1)=﹣6x+1 ﹣2(3x﹣1)=﹣6x﹣2 ﹣2(3x﹣1)=﹣6x+2
﹣6x2﹣15x2﹣3x ﹣6x3+15x2+3x ﹣6x3+15x2 ﹣6x3+15x2﹣1
g(x)=2x2-3x g(x)=3x2-2x g(x)=3x2+2x g(x)=-3x2-2x
﹣2(3x﹣1)=﹣6x﹣1 ﹣2(3x﹣1)=﹣6x+1 ﹣2(3x﹣1)=﹣6x﹣2 ﹣2(3x﹣1)=﹣6x+2
﹣3x2+4x+1 3x2﹣4x﹣1 ﹣3x2+1 3x2﹣1
3x﹣(2x﹣1)=3x﹣2x﹣1 ﹣4(x+1)+5=﹣4x+4+5 2x+7(x﹣1)=2x+7x﹣1 2﹣[3x﹣5(x+1)]=2﹣3x+5x+5