Hàm số $y=-{{x}^{2}}$ đồng biến khi:A. $\displaystyle x>0$ B. $\displaystyle x<0$ C. $x\in R$ D. Có hai câu đúng
Với giá trị nào của tham số m thì phương trình: $2{{x}^{2}}-x-m+1=0$có hai nghiệm phân biệt?A. $m>\frac{8}{7}$ B. $m<\frac{8}{7}$ C. $m<\frac{7}{8}$ D. $m>\frac{7}{8}$
Hệ số b’ của phương trình ${{x}^{2}}-2\left( 2m-1 \right)x+2m=0$ có giá trị nào sau đây ?A. $2m-1$ B. $-2m$ C. $-2\left( 2m-1 \right)$ D. $1-2m$
Đường thẳng nào sau đây không cắt Parabol $\displaystyle y\text{ }=\text{ }{{x}^{2}}$A. y=2x+5 B. y=-3x-6 C. y=-3x+5 D. y=-3x-1
Choose the word that has the underlined part pronounced differently from the rest:suit campsite contain essentialA. suit B. campsite C. contain D. essential
Choose the best answer for the following sentence:Most of the children come from large and poor families, which ____________ them from having proper schooling.A. makes B. prevents C. leads D. gets
Choose the best answer for the following sentence:Mai is interested ____________ taking an art course.A. in B. on C. of D. with
Diện tích của hình tròn là $\displaystyle 64\pi \text{ }\left( {c{{m}^{2}}} \right)$ thì chu vi của đường tròn đó là:A. $\displaystyle 64\pi \text{ }\left( {cm} \right)$ B. $\displaystyle 8\pi \text{ }\left( {cm} \right)$ C. $\displaystyle 32\pi \text{ }\left( {cm} \right)$ D. $\displaystyle 16\pi \text{ }\left( {cm} \right)$
Choose the correct sentence which is built from the words and phrases given:I / happy / receive / letter of invitation / this morningA. I was happy when receive your letter of invitation this morning. B. I was so happy to receive your letter of invitation this morning. C. I was happy to receive your letter of invitation this morning. D. I was happy so that I receive your letter of invitation this morning.
Choose the word that has the underlined part pronounced differently from the rest:visual music used namesA. visual B. music C. used D. names
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