ON
YOMEDIA

# Tìm x, biết (2/7x-1 1/2x):2/7=-21/4

thực hiện phép tính

a, 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Tìm x, biết:

a, 1,5+ 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( với x thuộc Z)

Theo dõi Vi phạm
YOMEDIA

## Trả lời (1)

• Bài 1: Dễ, tính máy tính là ra

Bài 2:

a) $$\dfrac{1}{5}+1\dfrac{1}{4}x=\dfrac{2}{3}$$

$$\Rightarrow1\dfrac{1}{4}x=\dfrac{7}{15}\Rightarrow x=\dfrac{28}{75}$$

Vậy $$x=\dfrac{28}{75}$$

b) $$\left(\dfrac{2}{7}x-1\dfrac{1}{2}x\right):\dfrac{2}{7}=\dfrac{-21}{4}$$

$$\Rightarrow\left(\dfrac{2}{7}x-\dfrac{3}{2}x\right):\dfrac{2}{7}=\dfrac{-21}{4}$$

$$\Rightarrow\dfrac{2}{7}x-\dfrac{3}{2}x=\dfrac{-3}{2}$$

$$\Rightarrow x\left(\dfrac{2}{7}-\dfrac{3}{2}\right)=\dfrac{-3}{2}$$

$$\Rightarrow\dfrac{-17}{14}x=\dfrac{-3}{2}\Rightarrow x=\dfrac{21}{17}$$

Vậy $$x=\dfrac{21}{17}$$

c) $$\dfrac{5}{8}+\dfrac{1}{3}:x=\dfrac{1}{2}$$

$$\Rightarrow\dfrac{1}{3}:x=\dfrac{-1}{8}\Rightarrow x=\dfrac{-8}{3}$$

Vậy $$x=\dfrac{-8}{3}$$

d) $$\dfrac{-5}{6}+\dfrac{8}{3}+\dfrac{-29}{6}< x< \dfrac{-1}{2}+2+\dfrac{5}{2}$$

$$\Rightarrow-3< x< 4$$

$$\Rightarrow x\in\left\{-2;-1;0;1;2;3\right\}$$ vì x thuộc Z

Vậy $$\Rightarrow x\in\left\{-2;-1;0;1;2;3\right\}$$

26/12/2018
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• ### Tính hợp lí 10 3/7-(2 1/8+4 3/7)

1. Tính ( hợp lí nếu có thể )

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2. Tìm x, biết:

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trị tuyệt đối...)

b)$$x+\dfrac{2}{3}x-\dfrac{4}{5}x=2\dfrac{1}{2}$$ e)$$\dfrac{15}{x}-\dfrac{1}{3}=\dfrac{28}{51}$$

c)$$45:\left(3x-4\right)=3^2$$

3.Một khu cườn hình chữ nhật có chiều dài 60 m. Chiều rộng bằng $$\dfrac{3}{4}$$ chiều dài

a) Tính diện tích đám đất

b) Người ta để $$\dfrac{7}{9}$$ diện tích đám đất trồng cây ăn quả. 30% diện tích còn lại đào ao thả cá. Tính diện tích đào ao thả cá

4. Trên nữa mặt phẳng bờ chứa tia Ox và hai tia Oy và Oz sao cho góc xOy=100o, xOz=20o.

a)Tính góc yOz

b)Vẽ Om là tia phân giác yOz. Tính xOm

26/12/2018

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