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Bai de vcl
A=4/7.31+6/7.41+9/10.41+7/10.57
A=20/35.31+30/35.31+45/50.41+35/50.57
A=5.(4/35.31+6/35.41+9/50.41+7/50.57)
=5.(1/31-1/35+1/35-1/41+1/41-1/50+1/50-1/57)
A=5.(1/31-1/57)
B=7/19.31+5/19.43+3/23.43+11/23.57
B=14/34.31+10/38.43+6/46.43+22/46.57
B=2.(7/34.31+5/38.43+3/46.43+11/46.57
B=2.(1/31-1/34+1/34-1/43+1/43-1/46+1/46-1/57)
B=2.(1/31-1/57)
5.(1/31-1/57)
Vay A/B=5/2
dau /la phan so do
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{5932+6001x5931}{5932x6001-69}\)
\(=\frac{6001+6001x5931-69}{5932x6001-69}\)
\(=\frac{6001x\left(1+5931\right)-69}{5932x6001-69}\)
\(=\frac{6001x5932-69}{5932x6001-69}\)
\(=1\)
\(\frac{5932+6001\times5931}{5932\times6001-69}\)
\(=\frac{5932+6001\times5931}{\left(5931+1\right)\times6001-69}\)
\(=\frac{5932+6001\times5931}{5931\times6001+6001-69}\)
\(=\frac{5932+6001\times5931}{5931\times6001+5932}\)
\(=1\)
~ Study Well ~
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5/3.13 + 5/13.23 + 5/23,33
= 1,975373039 + 5/23,33
=2,18968937
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![](https://rs.olm.vn/images/avt/0.png?1311)
S có số số hạng là: (328 - 22) : 3 + 1 = 103 (số hạng)
=> S = 22 + 25 + 28 + ... + 328 = (328 + 22) x 103 : 2 = 18025
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\(D=2.4+4.6+...+98.100\)
\(\Rightarrow6D=2.4.6+4.6.6+...+98.100.6\)
\(=2.4.6+4.6.\left(8-2\right)+...+98.100.\left(102-96\right)\)
\(=2.4.6-2.4.6+4.6.8+...+98.100.102-96.98.100\)
\(=98.100.102\)
\(=999600\)
\(\Rightarrow D=\frac{999600}{6}=166600\)
\(D=2.4+4.6+...+98.100\)
\(6D=2.4.6+4.6.6+...+98.100.6\)
\(=2.4.6+4.6.\left(8-2\right)+...+98.100.\left(102-96\right)\)
\(=2.4.6-2.4.6+4.6.8+...+98.100.102\)
\(=98.100.102\)
\(6D=999600\)
\(D=999600:6\)
\(D=166600\)
\(23.38+23.43+23.19=23.\left(38+43+19\right)=23.100=2300\)
Hok Tốt !!!!!!!!!!!!!!!!!!!!!
Bài làm :
\(23.38+23.43+23.19\)
\(=23.\left(38+43+19\right)\)
\(=23.100\)
\(=2300\)
Học tốt nha