你可能感兴趣的试题
(1,+∞) (-∞,1)∪(2,+∞) ∪(1,+∞)
5x3+2x 6x3+1 6x3+2x 6x2+2x
(2x﹣1)2=0 (2x﹣1)2=4 2(x﹣1)2=1 2(x﹣1)2=5
3a﹣2a=1 ﹣m﹣m=m2 2x2+2x2=4x4 7x2y3﹣7y3x2=0
={x|x2+2x>0}, ={x|x2+2x﹣3<0},则A.∩B.=( ) A.(﹣3,1)B.(﹣3,﹣2) R (﹣3,﹣2)∪(0,1)
4x6÷(2x2)=2x3 30=0 3﹣1=﹣3 x
2x﹣1=1﹣(3﹣x) 2(2x﹣1)=1﹣(3﹣x) 2(2x﹣1)=8﹣3+x 2(2x﹣1)=8﹣3﹣x
–2x(1-x) 2x(1-x) –2x(1+x) 2x(1+x)
3x2-2x2=1 x+x=x2 4x8÷2x2=2x4 x·x=x2
∀x∈R,2x2+1≤0 ∃x0∈R,2x02+1>0 ∃x0∈R,2x02+1<0 ∃x0∈R,2x02+1≤0
y=cos 2x+sin 2x y=cos 2x-sin 2x y=sin 2x-cos 2x y=sin xcos x
∀x>1,x2﹣2x﹣3=0 ∀x>1,x2﹣2x﹣3≠0 ∃x0≤1,x02﹣2x0﹣3=0 ∃x0≤1,x02﹣2x0﹣3≠0
f(x﹣1)=2x+2(0≤x≤2) f(x﹣1)=﹣2x+1(2≤x≤4) f(x﹣1)=2x﹣2(0≤x≤2) f(x﹣1)=2x﹣1(2≤x≤4)
∀x∈R,2x2﹣1<0 ∀x∈R,2x2﹣1≤0 ∃x∈R,2x2﹣1≤0 ∃x∈R,2x2﹣1>0
﹣40=1 2a(a+1)=2a2+2a (a+b)﹣1=a﹣1+b﹣1 (y﹣2x)(y+2x)=y2﹣2x2
x2﹣2x=0 x2﹣2x﹣1=0 x2﹣2x+1=0 x2﹣2x+2=0