Question

[Nguyễn Thị Phương Nhi]

Tính nhanh: 1,

\(\frac{423134x846267-423133}{846267x423133+423134}\)

2, 1919 x 18 - 1818 x 19

3, \(\frac{272727x28-282828x27}{1+2+3+.......+2014}\)

4, \(\frac{2929-101}{2x1919+404}\)

5, \(\frac{2}{7}-\frac{3}{8}+\frac{11}{7}+\frac{1}{3}+\frac{1}{7}-\frac{5}{8}\)

Answer 1

[Phạm Đức Nam Phương]

Ta có: 272727x28 - 282828x27 = 27x10101x28 - 28x10101x27 = 0

Vậy, phép tính đã cho bằng 0

4) \(\frac{29x101-101}{2x19x101+4x101}\)

= \(\frac{\left(29-1\right)x101}{\left(38-4\right)x101}\)

=\(\frac{28}{34}=\frac{14}{17}\)

5) \(\left(\frac{2}{7}+\frac{11}{7}+\frac{1}{7}\right)-\frac{3}{8}-\frac{5}{8}+\frac{1}{3}\)

= \(\frac{14}{7}-\frac{8}{8}+\frac{1}{3}\)

= \(2-1+\frac{1}{3}=\frac{4}{3}\)

Nhớ tk cho mình nhé

Answer 2

[Phạm Đức Nam Phương]

1\(\frac{423133x846267+423134}{423133x846267+423134}=1\))

\(\frac{\left(423133+1\right)x846267-423133}{423133x846267+423134}\)

=\(\frac{423133x846267+846267-423133}{423133x846267+423134}\)

= \(\frac{423133x846267+423134}{423133x846267+423134}\)

= 1

Nhớ tk cho mình nhé (các câu sau  làm riêng cho đỡ dài