Question

Đã trả lời bởi chuyên gia

Answer 1

ta có:

$4) \frac{1}{5} - \frac{4}{15} + \frac{8}{10} - \frac{11}{15} + \frac{107}{19} = \frac{1}{5} - \frac{15}{15} + \frac{8}{10} + \frac{107}{19} = \frac{- 12}{15} + \frac{8}{10} + \frac{107}{19} = \frac{- 456}{570} + \frac{456}{570} + \frac{3210}{570} = \frac{3210}{570} = \frac{107}{19} 5) \frac{3}{8} - \frac{7}{9} + \frac{10}{16} - \frac{2}{9} + \frac{15}{27} = (\frac{3}{8} + \frac{10}{16}) - (\frac{7}{9} + \frac{2}{9}) + \frac{15}{27} = (\frac{6}{16} + \frac{10}{16}) - 1 + \frac{15}{27} = \frac{15}{27} 6) \frac{4}{7} + \frac{15}{4} - \frac{11}{4} + \frac{3}{7} - \frac{1}{2} + \frac{1}{3} = (\frac{4}{7} + \frac{3}{7}) + \frac{15}{4} - \frac{11}{4} - (\frac{1}{2} - \frac{1}{3}) = 1 + \frac{4}{4} - (\frac{3}{6} - \frac{2}{6}) = 1 + 1 - \frac{1}{6} = 2 - \frac{1}{6} = \frac{12}{6} - \frac{1}{6} = \frac{11}{6}$

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Answer 2

ta có:

$4) \frac{1}{5} - \frac{4}{15} + \frac{8}{10} - \frac{11}{15} + \frac{107}{19} = \frac{1}{5} - \frac{15}{15} + \frac{8}{10} + \frac{107}{19} = \frac{- 12}{15} + \frac{8}{10} + \frac{107}{19} = \frac{- 456}{570} + \frac{456}{570} + \frac{3210}{570} = \frac{3210}{570} = \frac{107}{19} 5) \frac{3}{8} - \frac{7}{9} + \frac{10}{16} - \frac{2}{9} + \frac{15}{27} = (\frac{3}{8} + \frac{10}{16}) - (\frac{7}{9} + \frac{2}{9}) + \frac{15}{27} = (\frac{6}{16} + \frac{10}{16}) - 1 + \frac{15}{27} = \frac{15}{27} 6) \frac{4}{7} + \frac{15}{4} - \frac{11}{4} + \frac{3}{7} - \frac{1}{2} + \frac{1}{3} = (\frac{4}{7} + \frac{3}{7}) + \frac{15}{4} - \frac{11}{4} - (\frac{1}{2} - \frac{1}{3}) = 1 + \frac{4}{4} - (\frac{3}{6} - \frac{2}{6}) = 1 + 1 - \frac{1}{6} = 2 - \frac{1}{6} = \frac{12}{6} - \frac{1}{6} = \frac{11}{6}$

Answer 3

a,

$\frac{1}{5} - \frac{4}{15} + \frac{8}{10} - \frac{11}{15} + \frac{107}{19} = \frac{1}{5} - \frac{4}{15} + \frac{4}{5} - \frac{11}{15} + \frac{107}{19} = (\frac{1}{5} + \frac{4}{5}) - (\frac{4}{15} + \frac{11}{15}) + \frac{107}{19} = 1 - 1 + \frac{107}{19} = \frac{107}{19} b, \frac{3}{8} - \frac{7}{9} + \frac{10}{16} - \frac{2}{9} + \frac{15}{27} = \frac{3}{8} - \frac{7}{9} + \frac{5}{8} - \frac{2}{9} + \frac{15}{27} = (\frac{3}{8} + \frac{5}{8}) - (\frac{7}{9} + \frac{2}{9}) + \frac{15}{27} = 1 - 1 + \frac{15}{27} = \frac{15}{27} c, \frac{4}{7} + \frac{15}{4} - \frac{11}{4} + \frac{3}{7} - \frac{1}{2} + \frac{1}{3} = (\frac{4}{7} + \frac{3}{7}) + (\frac{15}{4} - \frac{11}{4}) - \frac{3}{6} + \frac{2}{6} = 1 + 1 - \frac{1}{6} = 2 - \frac{1}{6} = \frac{11}{6}$

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Answer 4

a,

$\frac{1}{5} - \frac{4}{15} + \frac{8}{10} - \frac{11}{15} + \frac{107}{19} = \frac{1}{5} - \frac{4}{15} + \frac{4}{5} - \frac{11}{15} + \frac{107}{19} = (\frac{1}{5} + \frac{4}{5}) - (\frac{4}{15} + \frac{11}{15}) + \frac{107}{19} = 1 - 1 + \frac{107}{19} = \frac{107}{19} b, \frac{3}{8} - \frac{7}{9} + \frac{10}{16} - \frac{2}{9} + \frac{15}{27} = \frac{3}{8} - \frac{7}{9} + \frac{5}{8} - \frac{2}{9} + \frac{15}{27} = (\frac{3}{8} + \frac{5}{8}) - (\frac{7}{9} + \frac{2}{9}) + \frac{15}{27} = 1 - 1 + \frac{15}{27} = \frac{15}{27} c, \frac{4}{7} + \frac{15}{4} - \frac{11}{4} + \frac{3}{7} - \frac{1}{2} + \frac{1}{3} = (\frac{4}{7} + \frac{3}{7}) + (\frac{15}{4} - \frac{11}{4}) - \frac{3}{6} + \frac{2}{6} = 1 + 1 - \frac{1}{6} = 2 - \frac{1}{6} = \frac{11}{6}$

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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