cứu mik với ạ mik cảm ơn nhiều
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a, \(=2x^2y^2-xy^2-4+5x^2y\)
-> bậc 4
b, \(=\dfrac{2}{3}xy^4-xyz-2x^4y+1\)
-> bậc 5
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1 It was such a difficult climb that we stopped to rest several times
2 She didn't ran fast enough to win the race
3 It was such a heavy bag that I had to ask for help
4 The house is too small for us to live in
5 Jack's suit was so elegant that everyone complimented him
6 My sister is not old enough to watch horror films
7 My mother is such a wise person that people often aske her for advice
8 The package is not light enough for you to lift by yourself
9 This book is too old for the children to eat
10 It was such an interesting book that I couldn't put it down
11 It is such a weak bird that it can't fly
12 These boyss aren't old enough to watch that film
13 They are such small sandals that they don't fit me
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4A:
a: ΔOBC cân tại O
mà OM là đường cao
nên M là trung điểm của BC
Xét tứ giác OCAB có
M là trung điểm chung của OA và BC
=>OCAB là hình bình hành
mà OB=OC
nên OCAB là hình thoi
b: Xét ΔOAB có OA=OB=AB
nên ΔOAB đều
=>góc BOA=60 độ
=>góc BOE=60 độ
Xét ΔBOE vuông tại B có
tan BOE=BE/BO
=>BE/R=tan60
=>\(BE=R\cdot tan60=R\sqrt{3}\)