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\(\frac{10+5}{4.5}=\frac{15}{20}=\frac{15:5}{20:5}=\frac{3}{4}\)
\(\frac{2^2.9}{27.2}=\frac{36}{54}=\frac{36:6}{54:6}=\frac{6}{9}=\frac{2}{3}\)
Tớ đầu tiên
a. 1-2+3-4+5-6+7-8+9-10 1+2+3+4+5+6+7+8+9+10
= (-1)+ (-1)+(-1)+(-1) (-1) =(10+1)10/2
=-5 =55
1-2+3-4+...+9-10/1+2+3+...+9+10=-5/55=-1/11
Bài 1:
a: =-3/7
b: =-3/5
c: =1/13
d: =-1/2
Bài 2:
a: \(=\dfrac{21\cdot11}{22\cdot9}=\dfrac{1}{2}\cdot\dfrac{7}{3}=\dfrac{7}{6}\)
b: \(=\dfrac{49\cdot8}{10}=\dfrac{196}{5}\)
a: \(\dfrac{4\cdot5+4\cdot11}{8\cdot7+4\cdot3}=\dfrac{4\cdot16}{4\left(2\cdot7+3\right)}=\dfrac{16}{17}=\dfrac{11088}{11781}\)
\(\dfrac{-15\cdot8+10\cdot7}{5\cdot6+20\cdot3}=\dfrac{-120+170}{30+60}=\dfrac{50}{90}=\dfrac{5}{9}=\dfrac{6545}{11781}\)
\(\dfrac{2^4\cdot5^2\cdot7}{2^3\cdot5\cdot7^2\cdot11}=2\cdot5\cdot\dfrac{1}{77}=\dfrac{10}{77}=\dfrac{1530}{11781}\)
\(\dfrac{3.17.11}{22.9}=\dfrac{17}{6}\)
\(\dfrac{84.45}{49.54}=\dfrac{10}{7}\)
\(\dfrac{4.7.22}{33.14}=\dfrac{4}{3}\)
\(\dfrac{-63}{72}=\dfrac{-7}{8}\)
\(\dfrac{20}{-140}=\dfrac{-1}{7}\)
\(\dfrac{3.10}{5.24}=\dfrac{30}{120}=\dfrac{1}{4}\)
\(\dfrac{3.7.11}{22.9}=\dfrac{231}{198}=\dfrac{7}{6}\)
\(\dfrac{8.5-8.2}{16}=\dfrac{24}{16}=\dfrac{3}{2}\)
\(\dfrac{11.4-11}{2-13}=\dfrac{33}{-11}=-3\)