Tìm x, biết:

a, x + | x - \(\dfrac{1}{2}\) | - 2|2x+3| = 5-2(x+1)

1. Cho tam giác ABC có \(\widehat{A}\) =60 độ, \(\widehat{B}\) = 50 độ, AB=3,5 cm. Trên tia đối của tia AB lấy điểm O. TRên nửa mặt phẳng không chứa điểm C bờ là đường thẳng AC. Vẽ tia Ox sao cho \(\widehat{BOx}=50\) độ. Gọi AI là tia phân giác của \(\widehat{CAO}\) .

Cmr: Ox // BC, Ay //BC

1. TÌm x, biết

a, C= \(\dfrac{2x+3}{5x+2}\) = \(\dfrac{4x+5}{10x+2}\)

1.Tìm x, biết.

a, \(|x|\) + x = \(\dfrac{1}{3}\)

b, \(|x+2|\) = x

c, \(\dfrac{2}{\left(x-1\right)\left(x-3\right)}\) + \(\dfrac{5}{\left(x-3\right)\left(x-8\right)}\) + \(\dfrac{12}{\left(x-8\right)\left(x-20\right)}\) - \(\dfrac{1}{x-20}\) = \(\dfrac{-3}{4}\)

d, \(\dfrac{3}{\left(x+2\right)\left(x+5\right)}\) + \(\dfrac{5}{\left(x+5\right)\left(x+10\right)}\) + \(\dfrac{7}{\left(x+10\right)\left(x+17\right)}\) = \(\dfrac{x}{\left(x+2\right)\left(x+17\right)}\)

e, \(\dfrac{x-1}{2009}\) + \(\dfrac{x-2}{2008}\) = \(\dfrac{x-3}{20007}\) + \(\dfrac{x-4}{2006}\)

1. Tính ( hợp lý nếu có thể )

a, A = \(\dfrac{7,5-0,6+\dfrac{3}{7}+\dfrac{3}{13}}{2,75-2,2+\dfrac{11}{7}+\dfrac{11}{3}}\)

b, B = 26 : \(\left[\dfrac{3:\left(0,2-0,1\right)}{2,5.\left(0,8+1,2\right)}+\dfrac{\left(34,06-33,81\right).4}{6.84:\left(28,57-25,15\right)}\right]\)+ \(\dfrac{2}{3}\) : \(\dfrac{4}{21}\)

c, C = \(\left[\left(\dfrac{2}{193}-\dfrac{3}{386}\right).\dfrac{193}{17}+\dfrac{33}{34}\right]\) : \(\left[\left(\dfrac{7}{2001}+\dfrac{11}{4002}\right).\dfrac{2001}{25}+\dfrac{9}{2}\right]\)

d, D = \(\dfrac{0.8:\left(\dfrac{4}{5}.1,25\right)}{0.64-\dfrac{1}{25}}\) + \(\dfrac{\left(1.08-\dfrac{5}{25}\right):\dfrac{4}{7}}{\left(6\dfrac{5}{9}-3\dfrac{1}{4}\right).2\dfrac{2}{7}}\) + ( 11,2 . 0,5 ) : \(\dfrac{4}{5}\)

Giúp mk nha chỉ là tính toán thông thường tính ra là đc nhưng mà mk lại khó tính ra nên các bn giúp mk nha

I. Use the given words to write the second sentences so that it means the same as the first.

1. When I was a child, we went to the local park every Sunday morning ( used to )

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2. Tom used to play badminton when he was young ( Tom doesn't )

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3. It's possible that Smith will visit Spain next year ( could )

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4. Jane hates getting up early ( can't stand )

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5. This bag had been left in the classroom by a careless student ( had left )

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I. Using the given words to witter the second sentences so that it means the same as the first.

1. When I was a child, we went to the local park every Sunday morning. ( used to )

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2. Tom used to play badminton when he was young ( tom doesn't )

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3. It's posible that Smith will visit Spain next year (could )

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4. Jane hates getting up early ( can't stand )

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5. This bag had been left in the classroom by a careless student. ( had left )

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