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若a·b>0,则a>0,b>0 若a·b<0,则a<0,b<0 若a·b=0,则a=0,且b=0 若a·b=0,则a=0,或b=0
(a)α=0,ω≠0,(b)α≠0,ω=0,(c)α=0,ω≠0 (a)α≠0,ω=0,(b)α≠0,ω≠0,(c)α≠0,ω=0 (a)α≠0,ω=0,(b)α≠0,ω≠0,(c)α=0,ω≠0 (a)α≠0,ω=0,(b)α=0,ω≠0,(c)α≠0,ω≠0
dp<0,dv>0,dc>0 dp<0,dv<0,dc<0 dp<0,dv<0,dc>0 dp>0,dv<0,dc<0
1 1 1 1 1
1 1 1 1 1
1 1 1 1 1
1 1 1 l 1
1 1 1 1 1 1
1
l
1
1 1 0 0 0 0
0 1 0 0 0
0 0 1 0 0
0 0 0 1 0
0 0 0 0 1 1 1 1 1 1
ρ>ρ`0>ρ0 ρ`0>ρ>ρ0 ρ>ρ0>ρ`0 ρ`0>ρ0>ρ
A*B=0 and A+B<>0 (A=0 or B=0) and (A<>0 Or B<>0) not(A=0 And B=0)and(A=0 or B=0) A*B=0 and(A=0 or B=0)
(0,0,0),(0,0,1),(1,0,0) (1,0,0),(1,0,1),(1,1,0) (0,1,0),(1,0,1),(0,0,1) (0,0,1),(1,0,1),(1,l,1)
a<0,b<0 a>0,b>0 a>0,b<0 a>0,b<0或a<0,b>0
/一0/二0/三0/四0 /一二/0三/00/四0 /一0/0二/三0/四0 /一0/二0/0三/四0
A*B=0 and A+B<>0 (A=0 or B=0)and(A<>0 Or B<>0) not(A=0 And B=0)and(A=0 or B=0) A*B=0 and (A=0 or B=0)
1,2,3,0,0,0,0,0,0,0, 1,2,3,1,2,3,0,0,0,0, 123,0,0,0,0,123,0,0,0,0, 1,2,3,0,0,1,2,3,0,0,
W=0,Q〉0,ΔU〉0,ΔH=0 W〉0,Q=0,ΔU〉0,ΔH〉0 W〈0,Q〉0,ΔU=0,ΔH=0 W=0,Q=0,ΔU=0,ΔH=0
G91G28X0Y0Z0; G90G28X0Y0Z0; GOG90G54X0Y0Z0; G0G90G55X0Y0Z0;
a<0,b<0 a>0,b>0 a≥0,b≤0 a<0,b>0或a>0,b<0 A.B.C.D.
∀x>0,x﹣lnx≤0 ∀x>0,x﹣lnx<0 ∃x0>0,x0﹣lnx0>0 ∃x0>0,x0﹣lnx0≤0
f"(0)<0,g"(0)>0. f"(0)<0,g"(0)<0. f"(0)>0,g"(0)>0. f"(0)>0,g"(0)<0.
0∶0∶0∶0∶0∶0∶0∶0 0∶0∶0∶0∶0∶0∶0∶1 0∶0∶0∶0∶0∶0∶1∶0 1∶0∶0∶0∶0∶0∶0∶0
∃x0∈(﹣∞,0),sinx0+x0<0 ∀x∈(﹣∞,0),sinx+x≥0 ∃x0∈[0,+∞),sinx0+x0<0 ∃x0∈[0,+∞),sinx0+x0≥0