Các câu hỏi tương tự
Tính nhanh:
a)\(\frac{5}{30}+\frac{15}{90}+\frac{25}{150}+\frac{35}{210}+\frac{45}{270}\)
b)\(\frac{1}{2}+\frac{1}{6}+\frac{1}{12}+\frac{1}{20}+...+\frac{1}{56}\)
c)\(\frac{1}{15}+\frac{4}{30}+\frac{2}{45}+\frac{16}{60}+\frac{25}{75}+\frac{36}{90}+\frac{49}{105}+\frac{64}{120}+\frac{81}{135}\)
Tính nhanh
\(A=\frac{15-\frac{15}{7}-\frac{15}{12}-\frac{15}{98}}{18-\frac{18}{7}-\frac{18}{12}-\frac{18}{98}}\)
Tính nhanh
\(A=\frac{15-\frac{15}{7}-\frac{15}{12}-\frac{15}{98}}{18-\frac{18}{7}-\frac{18}{12}-\frac{18}{98}}\)
Tính :
a) \(\frac{16.17-5}{16.16+11}\)
b) \(\frac{5}{30}+\frac{15}{90}+\frac{25}{150}+\frac{35}{210}+\frac{45}{270}\)
Tính nhanh\(\frac{15-\frac{15}{7}-\frac{15}{12}}{3-\frac{3}{7}-\frac{3}{12}}\)
(\(\frac{3}{7}\)*\(\frac{14}{15}\)+\(\frac{3}{7}\)*\(\frac{1}{15}\))*(15+\(\frac{11}{14}\)-14\(\frac{11}{14}\))
Tìm số tự nhiên y biết:
a) 52 x ( y : 78 ) = 3380
b) \(\frac{15}{19}\) x \(\frac{3}{8}\) < y < \(\frac{67}{15}\) + \(\frac{56}{15}\)
15 - \(\frac{15}{7}\) - \(\frac{15}{2}\)
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3 - \(\frac{3}{7}\) - \(\frac{3}{12}\)
Ai giúp mình mình sẽ cho một tick
tìm x , biết :
a) 15 + 3 ( x - 1 ) = 36
b) \(\frac{2}{3}x+\left(1\frac{1}{9}\right)=\frac{23}{15}x\frac{5}{6}\)