\(\dfrac{2011\times1990-2011\times999}{2012\times999+1013}\)
\(=\dfrac{2011\times1990-2011}{2012+1013}=\dfrac{2011\times\left(1990-1\right)}{3025}\)
\(=\dfrac{2011\times1989}{3025}=\dfrac{3999879}{3025}=\dfrac{14545}{11}\)
Tính nhanh :
2013 x 2012 - 1013 / 1000 + 2013 x 2011
Tính nhanh :
1\(\dfrac{4}{5}\) + 2\(\dfrac{5}{7}\) + 3\(\dfrac{4}{5}\) + 4\(\dfrac{5}{7}\)
Giúp mik nhanh với mik đang cần gấp
tính nhanh
\(\dfrac{76}{34}+\dfrac{98}{100}+\dfrac{38}{17}+\dfrac{49}{50}\)
Tính NHANH
\(\dfrac{5}{14}\) + \(\dfrac{7}{13}\) + \(\dfrac{26}{25}\)
Tính nhanh: \(\dfrac{1}{11}+\dfrac{10}{11x111}+\dfrac{100}{111x1111}\)
Bài 1
a) Tính
3\(\dfrac{5}{7}\) - 2\(\dfrac{5}{7}\) +6\(\dfrac{3}{8}\)
B) đặt tính rồi tính
23,04 + 5,182 56 + 38,29
C) tính nhanh
\(\dfrac{12x4x72}{36x2x9}\)
Bài 1
a) Tính
3\(\dfrac{5}{7}\) - 2\(\dfrac{5}{7}\) + 6\(\dfrac{3}{8}\)
B) đặt tính rồi tính
23,04 + 5,182 56 + 38,29
C) tính nhanh
\(\dfrac{12x4x72}{36x2x9}\)
Tính nhanh:
\(\dfrac{1}{6}\) + \(\dfrac{7}{12}\) - \(\dfrac{9}{20}\) + \(\dfrac{11}{30}\) - \(\dfrac{13}{42}\)
Tính nhanh: \(\dfrac{1}{2}\)+ \(\dfrac{1}{6}\)+ \(\dfrac{1}{12}\)+ \(\dfrac{1}{20}\) + ... + \(\dfrac{1}{90}\)
