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=(1-1/2)(1+1/2)*...*(1+1/10)(1-1/10)
=1/2*2/3*...*9/10*3/2*4/3*...*11/10
=1/10*11/2
=11/20
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\(\frac{4}{3}\times\frac{9}{8}\times...\times\frac{81}{80}=\frac{2^2}{1\times3}\times\frac{3^2}{2\times4}\times...\times\frac{9^2}{8\times10}\)
\(=\frac{2\times3\times4\times...\times9}{1\times2\times3\times...\times8}\times\frac{2\times3\times4\times...\times9}{3\times4\times5\times...\times10}\\ =\frac{9}{1}\times\frac{2}{10}=\frac{9}{5}\)
4/3.9/8.16/15.25/24.36/35.49/48.64/63.81/80
=3/2.16/15.25/24.36/35.49/48.64/63.81/80
=5/3.36/35.49/48.64/63.81/80
=7/4.64/63.81/80
=9/5
+
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a) \(3-\dfrac{5}{3}=\dfrac{1}{3};\dfrac{15}{7}-2=\dfrac{1}{7}\)
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a,\(\frac{4}{3}\)x \(\frac{9}{8}\)x \(\frac{16}{15}\)x \(\frac{25}{24}\)
= \(\frac{5}{3}\)
b, \(\frac{4}{3}\)x \(\frac{9}{8}\)x \(\frac{16}{15}\)x \(\frac{25}{24}\)x \(\frac{36}{35}\)x \(\frac{49}{48}\)x \(\frac{64}{63}\)x \(\frac{81}{80}\)
= \(\frac{9}{5}\)
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LÀM DÙM MIK VỚIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIKIIIIIII
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(36 × 27) : 3 = 36 × (27 : 3)
= 36 × 9
= 324
--------
(125 × 15) : 5
= 125 × (15 : 5)
= 125 × 3
= 375
--------
(15 × 12) : 9
= (5 × 3 × 12) : 9
= 5 × (36 : 9)
= 5 × 4
= 20
--------
450 : (3 × 5)
= 450 : 15
= 30
--------
(45 × 63) : 9
= 45 × (63 : 9)
= 45 × 7
= 40 × 7 + 5 × 7
= 280 + 35
= 315
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