TRẮC NGHIỆM 1) cho tam giác ABC vuông tại A ta có : A) A=B-C B) B-C=90 độ C) 2 góc B và C phụ nhau 2) cho hàm số y=f(x) =2x^2+3 ta có A) F(0)=5 B) F(1)=7 C) F(-1)=1 D) F(-2)=11 3) căn bậc x=5/2 thì x= ? A) 5/2 B) 25/4 C) -25/4 D) 10/4 4) khẳng định nào sau đây là đúng A.Hai góc đối đỉnh thì bù nhau C. Hai góc đối đỉnh thì bằng nhau B. Hai góc bằng nhau thì đối đỉnh D. Hai góc đối đỉnh thì phụ

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