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3x(x2–4x+4) 3x (x–4)2 3x(x+2)(x–2) 3x (x–2)2
(﹣3x+2y)(3x+2y) (3x﹣2y)(2y﹣3x) (﹣3x+2y)(﹣3x﹣2y) (3x+2y)(3x﹣2y)
2x+3x=9+5 2x﹣3x=9+5 2x﹣3x=﹣9+5 2x﹣3x=9﹣5
6x3+1 6x3﹣3 6x3﹣3x2 6x3+3x2
6x2+3x=9x3 6x2÷3x=2x (﹣6x2)3=36x6 6x2•3x=18x2
2x2,3x,5 2,﹣3,﹣5 2x2,﹣3x,﹣5 2x2﹣3x﹣5
由3x-2=2x+2,得x=4 由2x-3=3x,得x=3 由3x-5=7,得3x=7-5
5x2+3x=8x3 6x2•3x=18x2 (﹣6x2)3=﹣36x6 6x2÷3x=2x
∀x∈N*,3x2﹣2x+5<lnx ∀x∈N*,3x2﹣2x+5≤lnx ∃x∈N*,3x2﹣2x+5<lnx ∃x∈N*,3x2﹣2x+5≤lnx
3(-x2n+3xn) -3(x2n-3xn) -3xn(xn+3) -3xn(x2+3)
-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
3x2+2x3=5x5 2x2+3x2=5x2 2x2+3x2=5x4 2x2+3x3=6x5
﹣6x2﹣15x2﹣3x ﹣6x3+15x2+3x ﹣6x3+15x2 ﹣6x3+15x2﹣1
6x2+3x=9x3 6x2·3x=18x2 (-6x2)3=36x6 6x2÷3x=2x
﹣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