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3x(x2–4x+4) 3x (x–4)2 3x(x+2)(x–2) 3x (x–2)2
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
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
y=3x2+2x﹣5 y=3x2+2x﹣4 y=3x2+2x+3 y=3x2+2x+4
6x2+3x=9x3 6x2·3x=18x2 (-6x2)3=36x6 6x2÷3x=2x
1-x-3=3x 6-x-3=3x 6-x+3=3x 1-x+3=3x
﹣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