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o0vuchibao0o
2 năm trước
Tìm m để phương trình 3x^2+4.(m-1).x+m^2-4m+1=0 có hai nghiệm x1; x2 thỏa mãn 1/x1+1/x2 = 1/2 ( x1+x2)
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III. Put the verbs in brackets into a suitable tense. 1. You (clean) the room every day? 2. Anna (talk) on the phone to her pen pal. 3. You (visit) Paris last month, Mr. Lam 4. Vinh usually (go) to school on foot. 5. Mrs. Nhung (not take) the bus to work yesterday. 6. Peter (see) High School Musical tonight. 7. You (meet) Hoang and Phuong two days ago? 8. They (not open) the shop on Saturdays and Sundays. IV. Read the following text and fill each blank with a suitable word. Children prefer watching TV to reading books (1) their free time. They (2) two or three hours a day watching TV. Television has its good sides, because it is both entertaining (3) _ educational. However, watching too much TV (4) bad (5) children’s health, as it keeps children from taking part in other (6) activities. Therefore, children should (7) watch TV more (8) five hours a day.

vote 5 sao ạ! Phương trình nào sau đây không phải là phương trình bậc nhất một ẩn? LaTeX: \frac{\sqrt{7}}{x}+1=07 x + 1 = 0 LaTeX: \frac{x}{\sqrt{7}}+1=0x 7 + 1 = 0 LaTeX: \sqrt{7}x+1=07 x + 1 = 0 LaTeX: \sqrt{7}-x=0 Phương trình LaTeX: \left(x+2\right)\left(x-3\right)=x+2( x + 2 ) ( x − 3 ) = x + 2 tương đương với phương trình nào trong các phương trình sau: LaTeX: x+2=0x + 2 = 0 LaTeX: x-3=1x − 3 = 1 LaTeX: \left(x+2\right)\left(x-3-1\right)=0( x + 2 ) ( x − 3 − 1 ) = 0 LaTeX: x-3=0 Tập nghiệm của phương trình LaTeX: x\left(x-3\right)-\left(x+2\right)\left(x-1\right)=3x ( x − 3 ) − ( x + 2 ) ( x − 1 ) = 3 là: S=LaTeX: \left\{-4\right\}{ − 4 } S= LaTeX: \left\{4\right\}{ 4 } S= LaTeX: \left\{\frac{1}{4}\right\}{ 1 4 } S = LaTeX: \left\{\frac{-1}{4}\right\}

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