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\(\left(\frac{1}{15}+\frac{1}{35}+1\frac{1}{6}\right).x=1\)
\(\Rightarrow\frac{53}{42}.x=1\)
\(\Rightarrow x=1\div\frac{53}{42}\)
\(\Rightarrow x=\frac{42}{53}\)
~Study well~
#SJ
Bạn chưa đủ điểm làm người khác tăng SP đâu.
\(\left(\frac{1}{15}+\frac{1}{35}+1\frac{1}{63}\right)X=1\)
<=>\(\left(\frac{1}{15}+\frac{1}{35}+\frac{64}{63}\right)X=1\)
<=>\(\left(\frac{21}{315}+\frac{9}{315}+\frac{320}{315}\right)X=1\)
<=> \(\frac{350}{315}X=1\)
<=> \(X=\frac{9}{10}\)
CHÚC BN HỌC TỐT
\(\frac{1}{4}x+30\%x +x=62\)
=>\(\frac{1}{4}x+\frac{3}{10}x+x=62\)
=>\(\frac{10}{40}x+\frac{12}{40}x+\frac{40}{40}x=62\)
=>\(\frac{\left(10+12+40\right)x}{40}=62\)
=>\(\frac{62x}{40}=62\)
=>x=40
A.y/5 x 3/7 x 3 = 27/35.
y/5 x 3/7 = 27/35 :3
y/5 x 3/7 = 9/35
y/5 = 9/35 :3/7
y /5 = 3/5
y ;5 = 3:5
y:5 = 0,6
y = 0,6 x5
y = 3
#)Giải :
Đặt \(A=\frac{1}{5.6}+\frac{1}{6.7}+\frac{1}{7.8}+\frac{1}{8.9}+\frac{1}{9.10}\)
\(A=\frac{1}{5}-\frac{1}{6}+\frac{1}{6}-\frac{1}{7}+\frac{1}{7}-\frac{1}{8}+\frac{1}{8}-\frac{1}{9}+\frac{1}{9}-\frac{1}{10}\)
\(A=\frac{1}{5}-\frac{1}{10}\)
\(A=\frac{1}{10}\)
( 1 - 1 / 2 ) x ( 1 - 1 / 3 ) x K x (1 - 1 / 2019 ) x (1 - 1 / 2020 )
Chỗ chứ K đấy tớ thay bằng ... nhé
( 1 - \(\frac{1}{2}\) ) x ( 1 - \(\frac{1}{3}\) ) x ... x ( 1 - \(\frac{1}{2019}\) ) x ( 1 - \(\frac{1}{2020}\) )
= ( \(\frac{2}{2}\) - \(\frac{1}{2}\) ) x ( \(\frac{3}{3}\) - \(\frac{1}{3}\) ) x...x ( \(\frac{2019}{2019}\) - \(\frac{1}{2019}\) ) x ( \(\frac{2020}{2020}\) - \(\frac{1}{2020}\) )
= \(\frac{1}{2}\) x \(\frac{2}{3}\) x...x \(\frac{2018}{2019}\) x \(\frac{2019}{2020}\)
= \(\frac{1.2....2018.1019}{2.3.....2019.2020}\)
= \(\frac{1}{2020}\)
Học tốt !
\(\text{K - 2016 = }\frac{\text{1 + ( 1 + 2 ) + ( 1 + 2 + 3 ) + ... + ( 1 + 2 + 3 + ... + 2017 )}}{\text{2017 x 1 + 2016 x 2 + 2015 x 3 + ... + 2 x 2016 + 1 x 2017}}\)
\(\left(\frac{1}{5}+\frac{1}{35}+\frac{1}{62}\right)\times x=1\)
\(\frac{531}{2170}\times x=1\)
\(x=1\div\frac{531}{2170}\)
\(x=\frac{748}{217}\)
=))
\(\left(\frac{1}{5}+\frac{1}{35}+\frac{1}{62}\right)\cdot x=1\)
\(x=1:\left(\frac{1}{5}+\frac{1}{35}+\frac{1}{62}\right)\)
\(x=1:\frac{1}{5}+1:\frac{1}{35}+1:\frac{1}{62}\)
\(x=5+35+62\)
\(x=102\)
\(Good\)\(luck\)