Question

Đã trả lời bởi chuyên gia

Answer 1

ta có:

$7) \frac{1}{2} . (\frac{4}{5} - \frac{3}{2}) + x = 5 (x - \frac{1}{3}) = > \frac{2}{5} - \frac{3}{4} + x = 5 x - \frac{5}{3} = > 4 x = \frac{2}{5} - \frac{3}{4} + \frac{5}{3} = > 4 x = \frac{79}{60} = > x = \frac{79}{60} : 4 = > x = \frac{79}{60} \times \frac{1}{4} = > x = \frac{79}{240} 9) \frac{1}{2} x - \frac{5}{3} = \frac{1}{4} (\frac{1}{2} - 4) = > \frac{1}{2} x - \frac{5}{3} = \frac{1}{8} - 1 = > \frac{1}{2} x = \frac{1}{8} - 1 + \frac{5}{3} = > \frac{1}{2} x = \frac{3}{24} - \frac{24}{24} + \frac{40}{24} = > \frac{1}{2} x = \frac{19}{24} = > x = \frac{19}{24} : \frac{1}{2} = > x = \frac{19}{12} 11) \frac{3}{5} (x - \frac{5}{6}) - \frac{1}{2} (\frac{3}{2} - 1) = \frac{- 1}{4} = > \frac{3}{5} x - \frac{1}{2} - \frac{3}{4} + \frac{1}{2} = \frac{- 1}{4} = > \frac{3}{5} x = \frac{- 1}{4} + \frac{1}{2} + \frac{3}{4} - \frac{1}{2} = > \frac{3}{5} x = \frac{1}{2} = > x = \frac{1}{2} : \frac{3}{5} = > x = \frac{1}{2} \times \frac{5}{3} = > x = \frac{5}{6}$

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Answer 2

ta có:

$7) \frac{1}{2} . (\frac{4}{5} - \frac{3}{2}) + x = 5 (x - \frac{1}{3}) = > \frac{2}{5} - \frac{3}{4} + x = 5 x - \frac{5}{3} = > 4 x = \frac{2}{5} - \frac{3}{4} + \frac{5}{3} = > 4 x = \frac{79}{60} = > x = \frac{79}{60} : 4 = > x = \frac{79}{60} \times \frac{1}{4} = > x = \frac{79}{240} 9) \frac{1}{2} x - \frac{5}{3} = \frac{1}{4} (\frac{1}{2} - 4) = > \frac{1}{2} x - \frac{5}{3} = \frac{1}{8} - 1 = > \frac{1}{2} x = \frac{1}{8} - 1 + \frac{5}{3} = > \frac{1}{2} x = \frac{3}{24} - \frac{24}{24} + \frac{40}{24} = > \frac{1}{2} x = \frac{19}{24} = > x = \frac{19}{24} : \frac{1}{2} = > x = \frac{19}{12} 11) \frac{3}{5} (x - \frac{5}{6}) - \frac{1}{2} (\frac{3}{2} - 1) = \frac{- 1}{4} = > \frac{3}{5} x - \frac{1}{2} - \frac{3}{4} + \frac{1}{2} = \frac{- 1}{4} = > \frac{3}{5} x = \frac{- 1}{4} + \frac{1}{2} + \frac{3}{4} - \frac{1}{2} = > \frac{3}{5} x = \frac{1}{2} = > x = \frac{1}{2} : \frac{3}{5} = > x = \frac{1}{2} \times \frac{5}{3} = > x = \frac{5}{6}$

Answer 3

Bài làm.

$a, \frac{1}{2} . (\frac{4}{5} - \frac{3}{2}) + x = 5 (x - \frac{1}{3}) \to \frac{- 7}{20} + x = 5 x - \frac{5}{3} \to 4 x = \frac{79}{60} \to x = \frac{79}{240}$

$b, \frac{x}{2} - \frac{5}{3} = \frac{1}{4} . (\frac{1}{2} - 4) \to \frac{x}{2} = \frac{5}{3} - \frac{7}{8} \to \frac{x}{2} = \frac{19}{24} \to x = \frac{19}{12}$

$c, \frac{3}{5} . (x - \frac{5}{6}) - \frac{1}{2} . (\frac{3}{2} - 1) = \frac{- 1}{4} \to \frac{3 x}{5} - \frac{1}{2} - \frac{1}{4} = \frac{- 1}{4} \to \frac{3 x}{5} = \frac{1}{2} \to 3 x = \frac{5}{2} \to x = \frac{5}{6}$

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Answer 4

Bài làm.

$a, \frac{1}{2} . (\frac{4}{5} - \frac{3}{2}) + x = 5 (x - \frac{1}{3}) \to \frac{- 7}{20} + x = 5 x - \frac{5}{3} \to 4 x = \frac{79}{60} \to x = \frac{79}{240}$

$b, \frac{x}{2} - \frac{5}{3} = \frac{1}{4} . (\frac{1}{2} - 4) \to \frac{x}{2} = \frac{5}{3} - \frac{7}{8} \to \frac{x}{2} = \frac{19}{24} \to x = \frac{19}{12}$

$c, \frac{3}{5} . (x - \frac{5}{6}) - \frac{1}{2} . (\frac{3}{2} - 1) = \frac{- 1}{4} \to \frac{3 x}{5} - \frac{1}{2} - \frac{1}{4} = \frac{- 1}{4} \to \frac{3 x}{5} = \frac{1}{2} \to 3 x = \frac{5}{2} \to x = \frac{5}{6}$

Số thứ tự	Loại hàng	Số lượng (quyển)	Giá đơn vị (đồng)	Tổng số tiền (đồng)
1	Vở loại 1	35	2000	...
2	Vở loại 2	42	1500	...
3	Vở loại 3	38	1200	...
Cộng:				...

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