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\(E=\frac{5}{2\cdot4}+\frac{5}{4\cdot6}+...+\frac{5}{98\cdot100}\)
\(2E=\frac{5}{2}-\frac{5}{4}+\frac{5}{4}-\frac{5}{6}+...+\frac{5}{98}-\frac{5}{100}\)
\(2E=\frac{5}{2}-\frac{1}{20}\)
\(2E=\frac{49}{20}\)
\(E=\frac{49}{20}\cdot\frac{1}{2}=\frac{49}{40}\)
2/5= 0,4
3/4= 0,75
18/5= 3,6
mk nghĩ vậy ko chắc chắn đúng k nhé
\(\frac{2}{5}=\frac{2x2}{5x2}=\frac{4}{10}=0,4\)
\(\frac{3}{4}=\frac{3x25}{4x25}=\frac{75}{100}=0,75\)
\(\frac{18}{5}=\frac{18x2}{5x2}=\frac{36}{10}=3,6\)
Học tốt
\(11x-11.5=5x+11\Leftrightarrow11x-5x=55+11\)
\(\Leftrightarrow6x=66=>x=11\)
11 * X - 55 = 5 * X + 11
11 * X - 5 * X = 55 + 11
6 * X = 66
X = 66 : 6
X = 11
a : 12.03
b : 23.45
dung 999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999% luôn đó
10+2+3/100
=10+2+0,03
=12+0,03
=12,03
23+4/10+5/100
=23+0,4+0,05
=23,4+0,05
=23,45
Câu trả lời là :
5 + 5 + 5 + 5 + 5 - 5 = 20
Hok tốt .
5 + 5 + 5 + 5 + 5 - 5 = 20