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= (4 x 25) x 113 - (5 x 20) x 112
= 100 x 113 - 100 x 112
= 100 x (113 - 112)
= 100 x 1
= 100
4×113×25-5×112×20
=(4×25)×113-(5×20)×112)
=100×113-100×112
=100×(113-112)
=100×1
=100
\(\dfrac{7}{15}+\dfrac{4}{5}=\dfrac{7}{15}+\dfrac{12}{15}=\dfrac{19}{15}\)
\(\dfrac{2}{3}-\dfrac{3}{8}=\dfrac{16}{24}-\dfrac{9}{24}=\dfrac{7}{24}\)
\(\dfrac{4}{7}.\dfrac{21}{16}:\dfrac{5}{8}=\dfrac{4}{7}.\dfrac{21}{16}.\dfrac{8}{5}=\dfrac{4.3.7.4.2}{7.4.4.5}=\dfrac{6}{5}\)
\(a,\frac{2001}{2002}.\frac{5}{7}.\frac{2002}{5}.\frac{7}{2001}=\left(\frac{2001}{2002}.\frac{7}{2001}\right).\left(\frac{5}{7}.\frac{2002}{5}\right)\)
\(=\frac{7}{2002}.\frac{2002}{7}=1\)
\(b,\frac{5}{7}.\frac{7}{9}.\frac{9}{11}.\frac{11}{13}=\left(\frac{5}{7}.\frac{7}{9}\right).\left(\frac{9}{11}.\frac{11}{13}\right)=\frac{5}{9}.\frac{9}{13}\)
\(=\frac{5}{13}\)
chữ số lớn nhất là số 9
\(\Rightarrow\)a = 9
\(\Rightarrow\)32aaaa : a x 3 = 69984
k cho mk nha
24 x \(\frac{4}{6}\)x \(\frac{3}{4}\) = \(\frac{24}{1}\) x \(\frac{4}{6}\) x \(\frac{3}{4}\)
= \(\frac{24x4x3}{1x6x4}\)
= \(\frac{6x4x4x3}{1x6x4}\)
= 3
\(\frac{2}{3}+\frac{2007}{2009}+\frac{4}{3}-1\)
\(=\frac{2}{3}+\frac{4}{3}+\frac{2007}{2009}-1\)
\(=2+\frac{-2}{2009}\)
\(=\frac{4018}{2009}-\frac{2}{2009}\)
\(=\frac{4016}{2009}\)
Học tốt
13x42x11/11x3x13x2x35
1x42x1/3x2x35
42/210
\(\text{Chỉ cần ước lượng thôi mà bạn !}\)
\(\frac{13\text{ x }42\text{ x }11}{33\text{ x }26\text{ x }35}\)
\(=\frac{13\text{ x }2\text{ x }3\text{ x }7\text{ x }11}{11\text{ x }3\text{ x }2\text{ x }13\text{ x }5\text{ x }7}\)
\(=\frac{1}{5}\)