1 hours / straightening / Sarah / hair / her / every / morning. / spends

2 semester. / isn't / studying / class / in / French / this / He / our

3 very / crowd. / English / fluently / front / speaks / in / Daisy / of / the

4 complaining / cooking? / about / Why / always / you / my / are
 

a) A(x) + B(x) = (5x - 2x⁴ + x³ - 5 + x²) + (-x⁴ +4x² - 3x³ + 7 - 6x) 

= 5x - 2x⁴ + x³ - 5 + x² + -x⁴ +4x² - 3x³ + 7 - 6x

= (- 2x⁴ + -x⁴) + (x³ - 3x³) + (x² + 4x²) + (5x - 6x) + (-5 +7)

= -3x⁴ + -3x³ + 5x² + (-x) + 2

cho tam giác abc, góc bac = 90 độ. m là trung điểm của ab. trung trực của ab cắt bc tại o. c/m oa=oc từ đó suy ra o là giao điểm 3 đường trung trực tam giác abc

Diwali is also known as the Festival (51) ___________ Lights. It is the (52) ___________ important religious festival in India. The yearly festival is (53) ___________ all over the country in October or November. It gives people a chance to leam about the cultural richness of India. During the festival, people wear their best clothes and (54) ___________ ___their houses with thousands of candles and lights to welcome lakshmi - the Goddess of Wealth. There (55) ____________ also fireworks and music performances. Diwali attracts thousands of people because of its festive atmosphere.

51.  A. at        B. on    C. of     D. with

52.  A. most   B. many      C. more  D. as

53.  A. celebrate   B. celebratory   C. celebrated    D. celebration

54.  A. wash   B. repair    C. clean  D. decorate

55.  A. areB. is     C. was      D. be 

tìm nghiệm của đa thức G(x) = (2-3x) x (x+1)

chứng minh rằng nếu 1 tam giác có 2 trung tuyến bằng nhau thì đó là tam giác cân