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a)\(=\frac{1}{2}.\frac{2}{3}.\frac{3}{4}.\frac{4}{5}......\frac{99}{100}\)
\(=\frac{1.2.3.4.....99}{2.3.4.5.6.....100}\)
\(=\frac{1}{100}\)
b) Tương tự như câu a
a) \(\frac{3}{5}+25-\frac{1}{5}=\left(\frac{3}{5}-\frac{1}{5}\right)+25=\frac{2}{5}+25=\frac{2}{5}+\frac{125}{5}=\frac{127}{5}\)
b) \(13\times3\times32,27+67,63\times39=39\times32,27+67,63\times39\)
\(=39\times\left(32,27+67,63\right)\)
\(=39\times99,9=3196,8\)
(Bạn xem lại đề nhé)
c) \(\left(1-\frac{1}{2}\right)\times\left(1-\frac{1}{3}\right)\times\left(1-\frac{1}{4}\right)\times....\times\left(1-\frac{1}{100}\right)\)
\(=\frac{1}{2}\times\frac{2}{3}\times\frac{3}{4}\times.....\times\frac{99}{100}\)
\(=\frac{1\times2\times3\times...\times99}{2\times3\times4\times....\times100}=\frac{1}{100}\)
a, \(\frac{3}{5}+25-\frac{1}{5}=\frac{127}{5}\)
b, \(\text{13 x 3 x 32,27 + 67,63 x 39 =}3896,1\)
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thank for watching me do homework
a)13x3x32,27+67,63x39
=39x32,27+67,63x39
=39x(32,27+67,63)
=39x100
=3900
b,= 1- [ 1/2 x 1/3 x1/4 x..... x 1/100 ]
=1/2 x 2/3 x 3/4 x .......x 99/100
= 1x2x3x......x99 / 2x3x4x...... x100 [ rút gọn ]
= 1/100
Bài làm :
\(a\text{)}x-1\frac{3}{5}=2\frac{1}{10}\)
\(\Leftrightarrow x=2\frac{1}{10}+1\frac{3}{5}=\frac{37}{10}\)
\(b\text{)}5\frac{1}{7}\div x=4\frac{1}{2}\)
\(\Leftrightarrow x=5\frac{1}{7}\div4\frac{1}{2}=\frac{8}{7}\)
a) \(x-1\frac{3}{5}=2\frac{1}{10}\)
=> \(x-\frac{8}{5}=\frac{21}{10}\)
=> \(x=\frac{21}{10}+\frac{8}{5}=\frac{21}{10}+\frac{8\cdot2}{5\cdot2}=\frac{21}{10}+\frac{16}{10}=\frac{37}{10}=3\frac{7}{10}\)
b) \(5\frac{1}{7}:x=4\frac{1}{2}\)
=> \(\frac{36}{7}:x=\frac{9}{2}\)
=> \(x=\frac{36}{7}:\frac{9}{2}=\frac{36}{7}\cdot\frac{2}{9}=\frac{4}{7}\cdot\frac{2}{1}=\frac{8}{7}\)
Vậy : ...
Dấu " . " là dấu nhân nhá
(x - 21 x 13) : 11 = 30
=> x - 273 = 330
=> x = 603
vậy_
(627 - 138) : (x : 2) = 163
=> 489 : (x : 2) = 163
=> x : 2 = 3
=> x = 6
vậy_
\(\left(x-21.13\right):11=30\)
\(\left(x-273\right):11=30\)
\(\left(x-273\right)=30.11=330\)
\(x=330+273\)
\(x=603\)
a) X : 5 + X x\(\frac{1}{10}=0,24\)
X x \(\frac{1}{5}\)+ X x \(\frac{1}{10}=0,24\)
X x \(\left(\frac{1}{5}+\frac{1}{10}\right)\)=0,24
X x \(\frac{3}{10}\)= 0 , 2 4
X =0,8
b) X : 4 - X x \(\frac{1}{100}\)= 0,12
X x \(\frac{1}{4}\)- X x \(\frac{1}{100}\)=0,12
X x \(\left(\frac{1}{4}-\frac{1}{100}\right)\)=0,12
X x \(\frac{6}{25}\)=0,12
X =0,5
a ) x : 5 + x . \(\frac{1}{10}\)= 0,24
x . \(\frac{1}{5}\)+ x . \(\frac{1}{10}\) = 0,24
x . \(\left(\frac{1}{5}+\frac{1}{10}\right)\)= 0,24
x . \(\frac{3}{10}\)= 0,24
x = 0,24 : \(\frac{3}{10}\)
x = 0,8
b ) x : 4 - x . \(\frac{1}{100}\) = 0,12
x . \(\frac{1}{4}\)- x . \(\frac{1}{100}\)= 0,12
x . \(\left(\frac{1}{4}-\frac{1}{100}\right)\)= 0,12
x . \(\frac{6}{25}\)= 0,12
x = 0,12 : \(\frac{6}{25}\)
x = 0,5