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= 235 x ( - 36 ) + ( - 335 ) x ( - 36 )
= ( - 36 ) x [ 235 + ( - 335 )]
= ( - 36 ) x ( - 100 )
= 3600
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\(\frac{1}{2}+\frac{1}{3}+\frac{1}{4}+\frac{1}{5}+\frac{1}{6}\)
\(=\frac{29}{20}\)
\(\text{Cách thuận tiện nhất là............bấm máy tính Hì........}\)
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\(\frac{9}{10}-\frac{1}{90}-\frac{1}{72}-...-\frac{1}{6}-\frac{1}{2}\)
\(=\frac{9}{10}-\left(\frac{1}{2}+\frac{1}{6}+...+\frac{1}{72}+\frac{1}{90}\right)\)
\(=\frac{9}{10}-\left(\frac{1}{1.2}+\frac{1}{2.3}+...+\frac{1}{8.9}+\frac{1}{9.10}\right)\)
\(=\frac{9}{10}-\left(1-\frac{1}{2}+\frac{1}{2}-\frac{1}{3}+...+\frac{1}{8}-\frac{1}{9}+\frac{1}{9}-\frac{1}{10}\right)\)
\(=\frac{9}{10}-\left(1-\frac{1}{10}\right)\)
\(=\frac{9}{10}-\frac{9}{10}=0\)
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\(A=\frac{1}{2}+\frac{1}{4}+\frac{1}{6}+\frac{1}{8}=\frac{1}{2}\cdot\left(1+\frac{1}{2}+\frac{1}{3}+\frac{1}{4}\right)=\frac{1}{2}\cdot\frac{25}{12}=\frac{25}{24}\)
mấy bạn ơi cách của mấy bạn chưa có thuận tiện đâu theo mình là phải đặt 1/2 làm thừa số chung chứ
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35 x 36 + 36 x 63 + 36 : 1/2
= 35 x 36 + 36 x 63 + 36 x 2
= 36 x ( 35 + 63 + 2 )
= 36 x 100
= 3 600
/HT\
=35x36+36x63+36x2 (nếu bn ko hiểu tại sao mik nhân 2 thì: 36 : 1/2 = 36 x 2/1= 36 x2) =35x(35+63+2) = 35x100=3500
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= 3/2 + 2/3 + 2/4 + 2/5
= (6/4 + 2/4) + (2/3 + 2/5)
= 8/4 + 16/ 15
= 46/15
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quy đồng mẫu số : 3/8 = 9/24 1/6=4/24
15/24 -9/24-4/24=2/24
\(\frac{15}{24}\)- \(\frac{3}{8}\)-\(\frac{1}{6}\)=\(\frac{15}{24}\)-\(\frac{9}{24}\)-\(\frac{4}{24}\)
= \(\frac{15-9-4}{24}\)= \(\frac{2}{24}\)=\(\frac{1}{12}\)
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\(\left(\frac{1}{3}-1\right)\left(\frac{1}{6}-1\right)....\left(\frac{1}{36}-1\right)\)
\(=\left(\frac{1}{3}-\frac{3}{3}\right)\left(\frac{1}{6}-\frac{6}{6}\right).....\left(\frac{1}{36}-\frac{36}{36}\right)\)
\(=\frac{-2}{3}.\frac{-5}{6}........\frac{-35}{36}\)