1. Cho hình bình hành ABCD có \(AB=2AD\) ; \(\widehat{D}=70^o\). Vẽ \(BH\perp AD\left(H\in AD\right)\). Gọi M, N lần lượt là trung điểm cạnh CD, AB

a)CMR: tứ giác ANMD là hình thoi

b) Tính \(\widehat{HMC}\)

Phân tích các đa thức sau thành nhân tử:

a)\(3x^2+9x-30\)

b)\(12x^2+7x-12\)

Ai nhanh và đúng mình tick cho nhé

Cần gấp, giúp mình với T.T

1. Cho a, b, c, d là các số thực khác 0 thỏa mãn a+b = c+d và a³+b³ = c³+d³. Chứng minh rằng:

a²⁰¹⁹+b²⁰¹⁹ = c²⁰¹⁹+d²⁰¹⁹

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Choose the most suitable words in the blank space in the following passage

Almost all people have a (1)________ of examinations. Examinations, (2)__________ are a of our lives and all school in Viet Nam have examinations. Examinations were first (3)__________ in China about three thousand years ago. Scholars had (4)________ memorise long passages (5)_________ from several books. Those who đi well in examinations (6)________ allowed to enter the government service. Nowadays, the main (7)_________ of examinations is to test (8)__________ well a person understands the subjects which have been (9)_________. They are also used to find out how well student peform (10)_________ pressure.