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\(\frac{4\cdot7}{9\cdot32}=\frac{4\cdot7}{9\cdot8\cdot4}=\frac{7}{8\cdot9}=\frac{7}{72}\)
\(\frac{2\cdot5\cdot13}{26\cdot35}=\frac{2\cdot5\cdot13}{2\cdot13\cdot7\cdot5}=\frac{1}{7}\)
\(\frac{3\cdot21}{14\cdot15}=\frac{3\cdot3\cdot7}{2\cdot7\cdot3\cdot5}=\frac{3}{2\cdot5}=\frac{3}{10}\)
\(\frac{9\cdot6-9\cdot3}{18}=\frac{9\cdot\left(6-3\right)}{9\cdot2}=\frac{9\cdot3}{9\cdot2}=\frac{3}{2}\)
\(\frac{17\cdot5-17}{3-20}=\frac{17\cdot\left(5-1\right)}{-17}=\frac{17\cdot4}{17\cdot\left(-1\right)}=\frac{4}{-1}=-4\)
\(45dm^2=0,45m^2\)
\(300cm^2=0,03m^2\)
\(57500mm^2=0,0575m^2\)
\(d.\frac{2.5.13}{14.15}=\frac{2.5.13}{2.7.5}=\frac{13}{7}\)
\(e.\frac{9.6-9.3}{18}=\frac{9\left(6-3\right)}{9.2}=\frac{9.3}{9.2}=\frac{3}{2}\)
\(f.\frac{17.5-17.2}{3-20}=\frac{17\left(5-2\right)}{-17}=\frac{17.3}{-17}=-3\)
Thích chơi kiểu gạch này :v
d, \(\frac{2.5.13}{14.15}=\frac{2.5.13}{2.7.3.5}=\frac{13}{21}\)
e, \(\frac{9.6-9.3}{18}=\frac{54-27}{18}=\frac{27}{18}=\frac{3}{2}\)
f, \(\frac{17.5-17.2}{3-20}=\frac{17\left(5-2\right)}{-17}=\frac{17.3}{-17}=\frac{17.3}{-1.17}=\frac{3}{-1}=-3\)
a) 4.79.32=4.79.4.8=79.8=772
b) 3.2114.15=3.3.72.7.3.5=32.5=310
c) 2.5.1326.35=2.5.132.13.5.7=17
d) 9.6–9.318=9.(6–3)9.2=6–32=32
e) 17.5–173–20=17.(5–1)–17=5–1–1=–4
f)
a) \(\frac{25}{1188}\)
b)\(\frac{4}{3}\)
c)\(\frac{17\times4}{-17}=\frac{4}{-1}=\frac{-4}{1}=-4\)
\(\frac{2.3.\left(1+2.3+7.7\right)}{3.5.\left(1+2.3+7.7\right)}=\frac{2}{5}\)
