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AC>BC C-A>C-B A+C>B+C A/C>B/C
={0,1},则下列式子错误的是( ) A.0∈A. {1}∈A. ∅⊆A. {0,1}⊆A.
x﹣3>y﹣3 x+3>y+3 3﹣x>3﹣y
|-2| -(-2) (-2)-1 (-1)×(-2)
P(A+B)=P(A)+P(B)-P(AB) P(A)+P(B)=1 P(AB)=P(A)P(B) P(A/B)=P(A)[P(B)≠0]
P(AB)=P(A)P(B) P(A+B)=P(A)+P(B)-P(AB) P(A)=1-P(B) P(A B)=P(A)(P(B)≠0)
x-3>y-3 3-x>3-y x+3>y+2
5+3a>3+a; 5 –a>3-a; 5a>3a; ;
﹣|﹣5|>4 ﹣3<|﹣3| ﹣|﹣4|=4 |﹣5.5|<5
∣-5∣=-5 -∣-5∣= 5 -(-5)=- 5 -(-5)= 5
cos40°=sin50° tan15°•tan75°=1 sin225°+cos225°=1 sin60°=2sin30°
1MPa=1000000Pa 1MPa=1000atm 1MPa=9.869atm(标准大气压) 1MPA=10.19atm(工程大气压)
P(A=PP P(A+=P+P-P(A P+P=1 P(A/=P[P≠0]