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\(\frac{56}{78}\)\(=\)\(\frac{56.27}{78.27}\)\(=\)\(\frac{1512}{2106}\)
\(\frac{43}{27}\)\(=\)\(\frac{43.78}{27.78}\)\(=\)\(\frac{3354}{2106}\)
\(D\text{ấu}\)\(ch\text{ấm}\)\(ngh\text{ĩa}\)\(l\text{à}\)\(d\text{ấu}\)\(nh\text{â}n\).
tk nha bạn !
Mẫu số chung là 78x27=2106
\(\frac{56}{78}=\frac{56x27}{78x27}=\frac{1512}{2106}\)
\(\frac{43}{27}=\frac{43x78}{27x78}=\frac{3354}{2106}\)
\(\frac{15}{22}+\frac{y}{6}=\frac{4}{33}\)
\(\frac{y}{6}=\frac{15}{22}\div\frac{4}{33}\)
\(\frac{y}{6}=1\)
Vậy y = 6
k mk nha
A=1+1/3+1/9+...+1/729
3A=3+1+1/3+....+1/243
3A-A=(3+1+1/3+...+1/243)-(1+1/3+1/9+...+1/729)
2A=3-1/729
A=(3-1/729)/2
k cho mình nha
1 phần 4 = 10 phần 40
2 phần 5= 16 phần 40
3 phần 2= 50 phần 40
\(\frac{3}{6.8}+\frac{3}{8.10}+.......+\frac{3}{198.200}\)
\(=\frac{3}{2}.\left(\frac{2}{6.8}+\frac{2}{8.10}+........+\frac{2}{198.200}\right)\)
\(=\frac{3}{2}.\left(\frac{1}{6}-\frac{1}{8}+\frac{1}{8}-\frac{1}{10}+........+\frac{1}{198}-\frac{1}{200}\right)\)
\(=\frac{3}{2}.\left(\frac{1}{6}-\frac{1}{200}\right)\)
\(=\frac{3}{2}.\frac{97}{600}=\frac{97}{400}\)
\(3.\left(\frac{2}{6.8}+\frac{2}{8.10}+....+\frac{2}{198.200}\right).\frac{1}{2}\)
=\(3.\left(\frac{1}{6}-\frac{1}{8}+\frac{1}{8}-\frac{1}{10}+...+\frac{198}{200}\right).\frac{1}{2}\)
=\(3.\left(\frac{1}{6}-\frac{1}{200}\right).\frac{1}{2}\)
=.\(3.\frac{97}{600}.\frac{1}{2}\)=97/400
\(111111111111+11111111111=22222222222\)
111111111111 + 1111111111111 = 1222222222222
1000000000 x 1000000000000 = 1000000000000000000000
_Học_tốt_