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(xy)3=xy3 x5÷x5=x 3x2•5x3=15x5 5x2y3+2x2y3=10x4y9
-3x2y·5x2y=2x2y -2x2y3·2x3y=-2x5y4 35x3y2÷5x2y=7xy (-2x-y)(2x+y)=4x2-y2
2x+3y=5xy 3x﹣x=3 2x+3x=5x2 ﹣x2﹣x2=﹣2x2
3x-2x=1 3x+2x=5x2 3x·2x=6x 3x-2x=x
﹣6x2﹣15x2﹣3x ﹣6x3+15x2+3x ﹣6x3+15x2 ﹣6x3+15x2﹣1
∀x∈R,x2+5x≥6 ∀x∈R,x2+5x=6 ∃x0∈R,x02+5x0≥6 ∃x∈R,x02+5x0<6
x2>﹣5x x2≥﹣5x x2<﹣5x x2≤﹣5x
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