dien tiep hai phan so vao day sau: 1/31 4/31 9/31 16/31
1 nguoi tho lam buoi sang het 3/8cong viec.buoi chieu lam duoc 3/4 so cong viec con lai.tinh so phan cong viec con lai phai lam tiep vao hom sau.
1HCN co chieu dai gap ruoi chieu rong,chieu rong la 5/9 m.tinh chu vi va dien tinh HCN do
1 HCN co chieu dai gap ruoi chieu rong.sau khi tang moi canh 1 m thi HCn moi co dien tich hon dien tich HCN cu la 31 m.tinh dien tich HCN cu.
GAP,GAP
5/32
chu vi : 25/9 dien tich : 25/54
3. = tich da cau 3 moi kho giai
tim phan so tiep theo:1/3,1/7,1/13,1/21,1/31,....
so sanh hai phan so 16/51 va 31/90
Ta có\(\frac{16}{51}< \frac{17}{51}=\frac{1}{3};\frac{31}{90}>\frac{30}{90}=\frac{1}{3}\)
\(\Rightarrow\frac{16}{51}< \frac{1}{3}< \frac{31}{90}\Rightarrow\frac{16}{51}< \frac{31}{90}\)
Cac phan so
5 / 9 ; 15 / 45 ; 3 / 7 ; 11 / 19 ; 16 / 31
phan so nao bang phan so 1 / 3
cho phan so 31/32. Hay tim tong tat ca cac phan so bang phan số 31/32 ma co tu so cua moi phan so bang 1
SO sanh hai phan so sau ; -31/19 va -21/19
vì -31<-21 nên -31/19 < -21/19
Viet cac phan so thanh day:
1/1;2/1;1/2;3/1;2/2;1/3;4/1;3/2;2/3;1/4;.....
Phan so 50/31 la phan so thu may cua day..?
Co gang giup minh nhe hi hi!!!!!
tính nhanh
25/37 x 18/29 + 18/29 x 12/37
31/85 x 11/19 + 31/85 x 12/19 - 42/19 x 31/85
c , 16/53 : 17/9 - 16/53 : 17/8
1/5 x 12/31 x 4/3 + 19/31 x 4/15
a) \(\dfrac{25}{37}\times\dfrac{18}{29}+\dfrac{18}{29}\times\dfrac{12}{37}\)
\(=\dfrac{18}{29}\times\left(\dfrac{25}{37}+\dfrac{12}{37}\right)\)
\(=\dfrac{18}{29}\times\dfrac{37}{37}\)
\(=\dfrac{18}{29}\times1\)
\(=\dfrac{18}{29}\)
b) \(\dfrac{31}{85}\times\dfrac{11}{19}+\dfrac{31}{85}\times\dfrac{12}{19}-\dfrac{42}{19}\times\dfrac{31}{85}\)
\(=\dfrac{31}{85}\times\left(\dfrac{11}{19}+\dfrac{12}{19}-\dfrac{42}{19}\right)\)
\(=\dfrac{31}{85}\times\dfrac{-19}{19}\)
\(=\dfrac{31}{85}\times-1\)
\(=-\dfrac{31}{85}\)
c) \(\dfrac{16}{53}:\dfrac{17}{9}-\dfrac{16}{53}:\dfrac{17}{8}\)
\(=\dfrac{16}{53}:\left(\dfrac{9}{17}-\dfrac{8}{17}\right)\)
\(=\dfrac{16}{53}:\dfrac{1}{17}\)
\(=\dfrac{16}{901}\)
c) \(\dfrac{1}{5}\times\dfrac{12}{31}\times\dfrac{4}{3}+\dfrac{19}{31}\times\dfrac{4}{15}\)
\(=\dfrac{4}{15}\times\dfrac{12}{31}+\dfrac{19}{31}\times\dfrac{4}{15}\)
\(=\dfrac{4}{15}\times\left(\dfrac{12}{31}+\dfrac{19}{31}\right)\)
\(=\dfrac{4}{15}\times\dfrac{31}{31}\)
\(=\dfrac{4}{15}\times1\)
\(=\dfrac{4}{15}\)
a: =18/29*(25/37+12/37)
=18/29
b: =31/85(11/19+12/19-42/19)
=-31/85
c; =16/53(9/17+8/17)=16/53
d: =4/15(12/31+19/31)=4/15
Bài 2: Tính hợp lý
1/ (-105). 47 -105. 53; 2/ 45 – 5. (12 + 9)
3/ 24. (16 – 5) – 16. (24 - 5) 4/ 29. (19 – 13) – 19. (29 – 13)
5/ 31. (-18) + 31. ( - 81) – 31 6/ (-12).47 + (-12). 52 + (-12)
Em nến gõ bằng công thức toán học em nhé. Như vậy mọi người nới hiểu đúng đề bài để trợ giúp cho em một cách tốt nhất em ạ!