tính A=202202/1212+202202/2020+202202/3030+202202/4242+202202/5656
\(D=\frac{202202}{1212}+\frac{202202}{2020}+\frac{202202}{3030}+\frac{202202}{4242}+\frac{202202}{5656}\)
\(D=\frac{202202}{1212}+\frac{202202}{2020}+\frac{202202}{3030}+\frac{202202}{4242}+\frac{202202}{5656}\)
\(D=\frac{2002.101}{101.12}+\frac{2002.101}{20.101}+\frac{2002.101}{30.101}+\frac{2002.101}{42.101}+\frac{2002.101}{56.101}\)
\(D=\frac{2002}{12}+\frac{2002}{20}+\frac{2002}{30}+\frac{2002}{42}+\frac{2002}{56}\)
\(D=\frac{1001}{6}+\frac{1001}{10}+\frac{1001}{15}+\frac{143}{3}+\frac{143}{4}\)
\(D=\frac{5005}{12}\)
đáp án là 5005/12 nhé bạn
tích cho mik nha
\(Rút\)\(gọn:\)\(\frac{1001}{6}+\frac{1001}{10}+\frac{1001}{15}+\frac{143}{3}+\frac{143}{4}\)
\(=\frac{1001}{3}+\frac{1001}{12}=\frac{5005}{12}\)
Tính
D=\(\frac{202202}{1212}\)+\(\frac{202202}{2020}\)+\(\frac{202202}{3030}\)+\(\frac{202202}{4242}\)+\(\frac{202202}{5656}\)
AI LÀM ĐƯỢC MÌNH TICK CHO
\(=\frac{2002}{12}+\frac{2002}{20}+\frac{2002}{30}+\frac{2002}{42}+\frac{2002}{56}\)
\(=2002.\left(\frac{1}{3.4}+\frac{1}{4.5}+\frac{1}{5.6}+\frac{1}{6.7}+\frac{1}{7.8}\right)\)
\(=2002.\left(\frac{1}{3}-\frac{1}{4}+\frac{1}{4}-\frac{1}{5}+\frac{1}{5}-\frac{1}{6}+\frac{1}{6}-\frac{1}{7}+\frac{1}{7}-\frac{1}{8}\right)\)
\(=2002.\left(\frac{1}{3}-\frac{1}{8}\right)\)
\(=2002.\frac{5}{24}\)
\(=\frac{5005}{12}\)
Tính nhanh:
A=\(\frac{1}{6x10}+\frac{1}{10x14}+\frac{1}{14x18}+\frac{1}{18x22}+\frac{1}{22x26}+\frac{1}{26x30}\)
B=\(\frac{5}{2x3}+\frac{5}{3x4}+\frac{5}{4x5}+...+\frac{5}{8x9}\)
C=\(\left(\frac{7^2}{2x9}+\frac{7^2}{9x16}+...+\frac{7^2}{65x72}\right):\left(\frac{1}{3}-\frac{7}{36}\right)\)
D=\(\frac{2}{2x3x4}+\frac{2}{3x4x5}+...+\frac{2}{37x38x39}+\frac{2}{38x39x40}\)
E=\(\frac{202202}{1212}+\frac{202202}{2020}+\frac{202202}{3030}+\frac{202202}{4242}+\frac{202202}{5656}\)
Nhanh lên nha!Ngày mai mik đi học rồi!
\(A=\frac{1}{6.10}+\frac{1}{10.14}+\frac{1}{14.18}+\frac{1}{18.22}+\frac{1}{22.26}+\frac{1}{26.30}\)
\(=\frac{1}{4}.\left(\frac{1}{6}-\frac{1}{10}+\frac{1}{10}-\frac{1}{14}+\frac{1}{14}-\frac{1}{18}+\frac{1}{18}-\frac{1}{22}+\frac{1}{22}-\frac{1}{26}+\frac{1}{26}-\frac{1}{30}\right)\)
\(=\frac{1}{4}.\left(\frac{1}{6}-\frac{1}{30}\right)=\frac{1}{4}.\frac{2}{15}=\frac{1}{30}\)
\(B=\frac{5}{2.3}+\frac{5}{3.4}+\frac{5}{4.5}+...+\frac{5}{8.9}\)\(=5.\left(\frac{1}{2.3}+\frac{1}{3.4}+\frac{1}{4.5}+...+\frac{1}{8.9}\right)\) \(=5.\left(\frac{1}{2}-\frac{1}{3}+\frac{1}{3}-\frac{1}{4}+\frac{1}{4}-\frac{1}{5}+...+\frac{1}{8}-\frac{1}{9}\right)\)
\(=5.\left(\frac{1}{2}-\frac{1}{9}\right)=5.\frac{7}{18}=\frac{35}{18}\)
\(C=\left(\frac{7^2}{2.9}+\frac{7^2}{9.16}+....+\frac{7^2}{65.72}\right):\left(\frac{1}{3}-\frac{7}{36}\right)\)
\(=7.\left(\frac{7}{2.9}+\frac{7}{9.16}+...+\frac{7}{65.72}\right):\frac{5}{36}\) \(=7.\left(\frac{1}{2}-\frac{1}{9}+\frac{1}{9}-\frac{1}{16}+...+\frac{1}{65}-\frac{1}{72}\right):\frac{5}{36}\)'
\(=7.\left(\frac{1}{2}-\frac{1}{72}\right):\frac{5}{36}=7.\frac{35}{72}:\frac{5}{36}=\frac{49}{2}\)
\(D=\frac{2}{2.3.4}+\frac{2}{3.4.5}+...+\frac{2}{37.38.39}+\frac{2}{38.39.40}\)
\(=2.\left(\frac{1}{2.3.4}+\frac{1}{3.4.5}+...+\frac{1}{37.38.39}+\frac{1}{38.39.40}\right)\)
\(=2.\frac{1}{2}.\left(\frac{1}{2.3}-\frac{1}{3.4}+\frac{1}{3.4}-\frac{1}{4.5}+...+\frac{1}{37.38}-\frac{1}{38.39}+\frac{1}{38.39}-\frac{1}{39.40}\right)\)
\(=\frac{1}{2.3}-\frac{1}{39.40}=\frac{259}{1560}\)
\(E=\frac{202202}{1212}+\frac{202202}{2020}+\frac{202202}{3030}+\frac{202202}{4242}+\frac{202202}{5656}\)
\(=202202.\left(\frac{1}{3.4.101}+\frac{1}{4.5.101}+\frac{1}{5.6.101}+\frac{1}{6.7.101}+\frac{1}{7.8.101}\right)\)
\(=2002.\left(\frac{1}{3.4}+\frac{1}{4.5}+\frac{1}{5.6}+\frac{1}{6.7}+\frac{1}{7.8}\right)\)
\(=2002.\left(\frac{1}{3}-\frac{1}{4}+\frac{1}{4}-\frac{1}{5}+\frac{1}{5}-\frac{1}{6}+\frac{1}{6}-\frac{1}{7}+\frac{1}{7}-\frac{1}{8}\right)\)
\(=2002.\left(\frac{1}{3}-\frac{1}{8}\right)=2002.\frac{5}{24}=\frac{5005}{12}\)
Rút gọn các phân số 1212/1313và 201201/202202
1212 / 1313 = 12 / 13
201201 / 202202 = 6097 / 6094
ko biết
bạn có phân số nào bé hơn ko gửi đi mik làm co ahihi
\(\frac{1212}{1313}=\frac{12}{13}\)
\(\frac{201201}{202202}=\frac{201}{202}\)
so sánh
Ta có:\(\dfrac{201201}{202202}\)=\(\dfrac{201}{202}\);\(\dfrac{201201201}{202202202}\)=\(\dfrac{201}{202}\)
=>\(\dfrac{201}{202}\)=\(\dfrac{201}{202}\)
=> \(\dfrac{201201}{202202}\)=\(\dfrac{201201201}{202202202}\)
Vậy: \(\dfrac{201201}{202202}\)=\(\dfrac{201201201}{202202202}\)
(quá dễ)
ét ô ét = sos = cứu tôi với no biết toán lớp 6
hãy rút gọn phân số 201201/202202
\(\frac{201201}{202202}=\frac{201}{202}\)
\(\frac{201201}{202202}\) \(=\) \(\frac{201201:1001}{202202:1001}\) \(=\) \(\frac{201}{202}\)
Học tốt !
So Sánh : \(\dfrac{201201}{202202}\)và\(\dfrac{201201201}{202202202}\)
Ta có: \(\dfrac{201201}{202202}=\dfrac{201}{202}\)
\(\dfrac{201201201}{202202202}=\dfrac{201}{202}\)
Do đó: \(\dfrac{201201}{202202}=\dfrac{201201201}{202202202}\)
rút gọn phân số 201201/202202 viết cả cách làm nhé
rut gon 2 phan so sau : 13/125 , 201201/202202
Phân số đầu tiên không thể rút gọn , phân số thứ 2 : 201201 201201 : 1001 201
_______ = __________ = ____
202202 202202 : 1001 202
______ ___
abcabc : abc = 1001 em sẽ được học ở lớp 6 .
phan so thu nhat rut gon thanh phan so thap phan