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2x-y-3=0 x-2y+3=0 2x+y+5=0 x+2y-5=0
-2x-10+3x-3=0 -2x+10+3x-1=0 -2x+10+3x-3=0 -2x+5+3x-3=0
2x+5=1﹣x 3﹣2(x﹣1)=7﹣x x﹣5=5﹣x 1﹣x=x
2x+y+5=0或2x+y﹣5=0 2x+y+=0或2x+y﹣=0 2x﹣y+5=0或2x﹣y﹣5=0 2x﹣y+=0或2x﹣y﹣=0
∃x∈R.,x2+4x+5>0 ∃x∈R.,x2+4x+5≤0 ∀x∈R.,x2+4x+5>0 ∀x∈R.,x2+4x+5≤0
x2﹣5x+5=0 x2+5x﹣5=0 x2+5x+5=0 x2+5=0
x1=0,x2=﹣5 x=5 x1=0,x2=5 x=0
∀x∈R.,x2﹣5x+1≤0 ∃x∈R.,x2﹣5x+1≤0 ∀x∈R.,x2﹣5x+1<0 ∃x∈R.,x2﹣5x+1>0
x1=0,x2=﹣5 x=5 x1=0,x2=5 x=0
x+2y-5=0 x+2y+5=0 2x-y=0或x+2y-5=0 2x-y=0或x-2y+3=0
x1=0,x2=5 x1=0,x2=﹣5 x=0 x=5
2x+y-12=0 2x+y-12=0或2x-5y=0 x-2y-1=0 x+2y-9=0或2x-5y=0
{x|x∈R.,且x≠5,x≠2} {x|x>2} {x|x>5} {x|25}
x=0 x=5 x1=0,x2=5 x1=0,x2=﹣5
x﹣2y﹣7=0 2x+y+1=0 2x﹣y﹣5=0 x+2y+5=0
x-y-2=0或5x+4y-1=0 x-y-2=0 x-y+2=0 x-y-2=0或4x+5y+1=0
∀x∈R,x2+5x≥6 ∀x∈R,x2+5x=6 ∃x0∈R,x02+5x0≥6 ∃x∈R,x02+5x0<6
5x2-4x-4=0 x2-5=0 5x2-2x+1=0 5x2-4x+6=0
不存在x∈R.,x4-x3+x2+5≤0 存在x∈R.,x4-x3+x2+5≤0 存在x∈R.,x4-x3+x2+5>0 对任意x∈R.,x4-x3+x2+5>0
∃x∈R.,x2﹣3x+5≤0 ∃x∈R.,x2﹣3x+5>0 ∀x∈R.,x2﹣3x+5<0 ∀x∈R.,x2﹣3x+5≤0