Tính
5/2 . 3 + 5/3 .4+5/4 .5 +.......+5/99.100
/ là phần nha .5/2 là 5 phần 2
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\(\frac{5}{7}\).(\(\frac{1}{2}\)-\(\frac{1}{3}\)+\(\frac{4}{7}\)) +(\(\frac{1}{2}\)-\(\frac{1}{3}\)+\(\frac{4}{7}\)):\(\frac{7}{5}\)
= \(\frac{5}{7}\).(\(\frac{1}{2}\)-\(\frac{1}{3}\)+\(\frac{4}{7}\))+(\(\frac{1}{2}\)-\(\frac{1}{3}\)+\(\frac{4}{7}\)).\(\frac{5}{7}\)
=2.\(\frac{5}{7}\).(\(\frac{1}{2}\)-\(\frac{1}{3}\)+\(\frac{4}{7}\))
=\(\frac{10}{7}\).(\(\frac{21}{42}\)-\(\frac{8}{42}\)+\(\frac{24}{42}\))
=\(\frac{10}{7}\).\(\frac{37}{42}\)=\(\frac{185}{147}\)
\(5\dfrac{5}{11}-\left(2\dfrac{3}{5}\cdot4\dfrac{6}{11}\right)=\dfrac{60}{11}-\left(\dfrac{13}{5}\cdot\dfrac{50}{11}\right)=\dfrac{60}{11}-\dfrac{130}{11}=-\dfrac{70}{11}\)
a) x-5/7=3/5x1/2
x-5/7=3/10
x. =3/10+5/7
x. =71/70
b) Xx2/3=5/8x3/4
Xx2/3=15/32
X =15/32:2/3
X =45/64
a) x - 5/7 = 3/5 × 1/2
x - 5/7 = 3/10
x = 3/10 + 5/7
x = 71/70
b) x × 2/3 = 5/8 × 3/4
x × 2/3 = 15/32
x = 15/32 : 2/3
x = 45/64
\(\frac{1}{4}+\frac{3}{5}=\frac{17}{20}\)
\(\frac{5}{2}+\frac{7}{9}=\frac{59}{18}\)
\(\frac{3}{2}+\frac{2}{3}=\frac{13}{6}\)
\(\frac{4}{5}+\frac{3}{2}=\frac{23}{10}\)
\(\frac{4}{5}+\frac{3}{15}=\frac{4}{5}+\frac{1}{5}=1\)
\(\frac{2}{3}+\frac{32}{24}=\frac{2}{3}+\frac{4}{3}=2\)
\(\frac{5}{6}+\frac{15}{18}=\frac{5}{6}+\frac{5}{6}=\frac{10}{6}=\frac{5}{3}\)
\(\frac{8}{15}+\frac{2}{3}=\frac{8}{15}+\frac{10}{15}=\frac{18}{15}=\frac{6}{5}\)
\(\frac{3}{7}+\frac{4}{8}=\frac{24}{56}+\frac{28}{56}=\frac{52}{56}=\frac{13}{14}\)
_HT_
bài 4:so sánh
5/2 lớn hơn 3/7
4/3 lớn hơn,3/2 lớn hơn
bài 6:rút gọn các phân số sau:
3/9=1/3 9/12=3/4 8/18=4/9 60/36=10/6 17/34=1/2 17/51=1/3 35/100=7/20 25/100=1/4 8/1000=1/125 24/30=4/5 18/54=1/3 72/42=12/7
đay nhé mk chưa làm hết đc bn viết liền quá mk nhìn khó mà mk hỏi bài 7 là nhân hay cộng vậy?
\(\frac{5}{2.3}+\frac{5}{3.4}+\frac{5}{4.5}+...+\frac{5}{99.100}\)
\(=5.\left(\frac{1}{2.3}+\frac{1}{3.4}+\frac{1}{4.5}+....+\frac{1}{99.100}\right)\)
\(=5.\left(\frac{1}{2}-\frac{1}{3}+\frac{1}{3}-....-\frac{1}{100}\right)\)
\(=5.\left(\frac{1}{2}-\frac{1}{100}\right)=\frac{5.49}{100}=\frac{49}{20}\)
5/2 . 3 + 5/3 .4+5/4 .5 +.......+5/99.100
= ( 1 / 2.3 + 1 /3.4 + 1 / 4.5 + ..... + 5 / 99. 100 ). 5
= 5 ( 1 / 2 - 1 / 3 + 1 / 3 - 1 / 4 + 1 / 4 - 1 / 5 +.... + 1 / 99 - 1 / 100 )
= 5 ( 1 / 2 - 1 / 100 )
= 5 . 49 / 100
= 49 / 20