题目内容
A.A
B.∈B
C.A∩B
D.∈(A)∩(B)
(1)若a=b,则a2=b2;
(2)若|2x+1|≥1,则x2+x>0;
(3)若△ABC≌△PQR,则S△ABC=S△PQR.
A.A B.∈SB
C.A∩B D.∈(SA)∩(SB)
(1)若a=b,则a2=b2;
(2)若|2x+1|≥1,则x2+x>0;
A.A B.∈B
C.A∩B D.∈(A)∩(B)