75x4x5x7x10:14x1:5=
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\(a,\dfrac{7}{9}\times\dfrac{3}{14}:\dfrac{5}{8}=\dfrac{7}{9}\times\dfrac{3}{14}\times\dfrac{8}{5}=\dfrac{4}{15}\)
\(b,\dfrac{3}{5}\times\dfrac{4}{21}\times\dfrac{25}{3}=\dfrac{20}{21}\)
\(c,\dfrac{15}{16}:\dfrac{5}{8}\times\dfrac{3}{4}=\dfrac{15}{16}\times\dfrac{8}{5}\times\dfrac{3}{4}=\dfrac{9}{8}\)
\(d,\dfrac{21}{4}\times\dfrac{16}{14}\times\dfrac{1}{2}\times\dfrac{8}{3}=8\)
Cách 1:
A. \(\dfrac{17}{19}\) x \(\dfrac{12}{15}\) x \(\dfrac{19}{17}\)
= (\(\dfrac{17}{19}\) x \(\dfrac{19}{17}\)) x \(\dfrac{12}{15}\)
= \(1\) x \(\dfrac{12}{15}\)
= \(\dfrac{4}{5}\)
Cách hai:
A; \(\dfrac{17}{19}\) x \(\dfrac{12}{15}\) x \(\dfrac{19}{17}\)
= \(\dfrac{68}{95}\) x \(\dfrac{19}{17}\)
= \(\dfrac{4}{5}\)
câu A cách 1
\(\dfrac{17}{19}\times\dfrac{12}{15}\times\dfrac{19}{17}\)
=\(\dfrac{17\times12\times19}{19\times15\times17}\)
=\(\dfrac{12}{15}\)
câu A cách 2
\(\dfrac{17}{19}\times\dfrac{12}{15}\times\dfrac{19}{17}\)
=\(\dfrac{17}{19}\times\dfrac{19}{17}\times\dfrac{12}{15}\)
=1 x \(\dfrac{12}{15}\)
=\(\dfrac{12}{15}\)
\(\frac{3}{7}.\frac{9}{26}-\frac{1}{14}.\frac{1}{13}\)
\(=6.\frac{1}{14}.\frac{1}{13}.\frac{9}{2}-\frac{1}{14}.\frac{1}{13}\)
\(=\frac{1}{14}.\frac{1}{13}.\left(\frac{6.9}{2}-1\right)\)
\(=\frac{1}{182}.26\)
\(=\frac{1}{7}\)
3/7.9/26-1/14.1/13=3.9/7.26-1/14.1/13
=27/182-1/14.1/13
=27/182-1.1/14.13
=27/182-1/182
=26/182=1/7
\(75×4×5×7×10:14×1:5\)
\(=300×5×7×10:14×1:5\)
\(=1500×7×10:14×1:5\)
\(=10500×10:14×1:5\)
\(=105000:14×1:5\)
\(=7500×1:5\)
\(=7500:5=1500\)
k cho mik nha ✅
Bằng 1500