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\(=\frac{1}{10}+\frac{1}{10}+\frac{1}{10}+\frac{1}{10}+...+\frac{1}{10}\)có 9 p/số
\(=\frac{1}{10}.9=\frac{9}{10}\)
1/10+4/20+9/30+16/40+25/50+36/60+49/70+64/80+81/90
=1/10+2/10+3/10+4/10+5/10+6/10+7/10+8/10+9/10
=1+2+3+4+5+6+7+8+9/10
=45/10 (tự rút gọn)
0,1 0,5 0,3du3 0,2 du8 0,2 0,1 du24 0,1du21 0,1 du16 0,1 du9
= \(x^8.\frac{1}{10}.\frac{2}{9}.\frac{3}{8}.\frac{4}{7}.\frac{5}{6}.\frac{6}{5}.\frac{7}{4}.\frac{8}{3}.\frac{9}{2}\)
= \(x^8.\frac{1}{10}.\left(\frac{2}{9}.\frac{9}{2}\right).\left(\frac{3}{8}.\frac{8}{3}\right).\left(\frac{4}{7}.\frac{7}{4}\right).\left(\frac{5}{6}.\frac{6}{5}\right)\)
= \(x^8.\frac{1}{10}.1.1.1.1\)
= \(x^8.\frac{1}{10}\)
Mk ko pik co dung ko nua
\(=\frac{1}{10}+\)\(\frac{1}{10}+\)\(\frac{1}{10}+\)\(\frac{1}{10}+\)\(\frac{1}{10}+\)\(\frac{1}{10}+\)\(\frac{1}{10}+\)\(\frac{1}{10}+\)\(\frac{1}{10}\)
\(=\frac{1}{10}.9\)
\(=\frac{9}{10}\)
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\(\frac{1}{10}+\frac{2}{20}+\frac{3}{30}+\frac{4}{40}+\frac{5}{50}+\frac{6}{60}+\frac{7}{70}+\frac{8}{80}+\frac{9}{90}\)
\(=\frac{1}{10}+\frac{1}{10}+\frac{1}{10}+\frac{1}{10}+\frac{1}{10}+\frac{1}{10}+\frac{1}{10}+\frac{1}{10}+\frac{1}{10}\)
\(=\frac{1}{10}\times9\)
\(=\frac{9}{10}\)
x + 1= 1
x= 1- 1
x= 0
= x=0
k cho
\(\frac{1}{10}\) + \(\frac{2}{20}\) + \(\frac{3}{30}\) + \(\frac{4}{40}\) + \(\frac{5}{50}\) + \(\frac{6}{60}\) + \(\frac{7}{70}\) + \(\frac{8}{80}\) + \(\frac{9}{90}\)
= \(\frac{1}{10}\) + \(\frac{1}{10}\) + \(\frac{1}{10}\) + \(\frac{1}{10}\) + \(\frac{1}{10}\) + \(\frac{1}{10}\) + \(\frac{1}{10}\) + \(\frac{1}{10}\) + \(\frac{1}{10}\)
= \(\frac{1}{10}\)x \(9\)
= \(\frac{9}{10}\)
\(=\left(\frac{1}{10}+\frac{9}{90}\right)+\left(\frac{2}{20}+\frac{8}{80}\right)+\left(\frac{3}{30}+\frac{7}{70}\right)+\left(\frac{4}{40}+\frac{6}{60}\right)+\frac{5}{50}\)
\(=\frac{10}{100}+\frac{10}{100}+\frac{10}{100}+\frac{10}{100}+\frac{5}{50}\)
\(=\frac{10}{100}+\frac{10}{100}+\frac{10}{100}+\frac{10}{100}+\frac{10}{100}\)
\(=\frac{50}{100}\)
\(\frac{1}{10}+\frac{2}{20}+\frac{3}{30}+\frac{4}{40}+\frac{5}{50}+\frac{6}{60}+\frac{7}{70}+\frac{8}{80}+\frac{9}{90}\)
\(=\frac{1}{10}+\frac{1}{10}+\frac{1}{10}+\frac{1}{10}+\frac{1}{10}+\frac{1}{10}+\frac{1}{10}+\frac{1}{10}+\frac{1}{10}\)
\(=\frac{1}{10}\times9\)
\(=\frac{9}{10}\)
1/10 + 1/10 + 1/10 + 1/10 + 1/10 + 1/10 + 1/10 + 1/10 + 1/10
=9/10
9
_ = 100%
10
9/10 !
=9/10
\(=\frac{9}{10}=0,9\)
\(\frac{1}{10}+\frac{2}{20}+\frac{3}{30}+\frac{4}{40}+\frac{5}{50}+\frac{6}{60}+\frac{7}{70}+\frac{8}{80}+\frac{9}{90}\)\(\frac{9}{90}\)
= \(\frac{1}{10}+\frac{1}{10}+\frac{1}{10}+\frac{1}{10}+\frac{1}{10}+\frac{1}{10}+\frac{1}{10}\)+ \(\frac{1}{10}+\frac{1}{10}\)
= \(\frac{1}{10}\) \(x\)\(9\)
= \(\frac{9}{10}\)
# Hok tốt
\(\frac{1}{10}+\frac{1}{10}+\frac{1}{10}+\frac{1}{10}+\frac{1}{10}+\frac{1}{10}+\frac{1}{10}+\frac{1}{10}+\frac{1}{10}+\frac{1}{10}\)
=\(\frac{1}{10}x9\)
=\(\frac{9}{10}\)
Đúng 100% bài này mình dc cô chữa lúc học lớp 5 rồi.