So sánh các phân số sau:
a)\(\dfrac{3}{124};\dfrac{1}{41};\dfrac{5}{207};\dfrac{2}{83}\)
b) \(\dfrac{27}{82};\dfrac{26}{75}\)
c) \(\dfrac{134}{43};\dfrac{55}{21};\dfrac{74}{19};\dfrac{116}{37}\)
d) \(\dfrac{-2525}{2929};\dfrac{-217}{245}\)
e) \(\dfrac{-49}{78};\dfrac{64}{-95}\)
so sánh:
-49/78 và 64/-95
Bai 2 : so sanh cac phan so sau ;
a,1/2;1/3;2/3 b, 4/9;-1/2;3/7 c, 27/82 va 26/75 d, -49/78 va 64/-95
So sánh hai phân số không cần quy đồng mẫu số:\(\dfrac{49}{38}vs\dfrac{75}{64}\)
\(\dfrac{13}{92}vs\dfrac{2}{13}\)
so sánh:\(\dfrac{-64}{85}\) và -\(\dfrac{73}{81}\)
\(\dfrac{-11}{-32}\) và \(\dfrac{16}{49}\)
I tính
1,\(\dfrac{3}{4}.\dfrac{8}{9}.\dfrac{15}{16}.\dfrac{24}{25}.\dfrac{35}{36}.\dfrac{48}{49}.\dfrac{63}{64}\)
2, 1,2+2,3+......+8,9+9,10+10,11+......+98,99+100,101+......+998,999
3, 1,2+2,4+3,6+4,8+5,10+6,12+....+45,90
4, 1,1+1,11+1,111+......+1,111....11+1,11111....111
(9 số 1) (10 so 1)
Bài tập: So sánh:
a, \(\dfrac{12}{49}\&\dfrac{13}{47}\)
\(b,\dfrac{64}{85}\&\dfrac{17}{35}\)
\(c,\dfrac{19}{31}\&\dfrac{17}{35}\)
(Gợi ý: a,b,c: Phân số chung gian)
\(d,\dfrac{67}{77}\&\dfrac{73}{83}\)
\(e,\dfrac{456}{461}\&\dfrac{123}{128}\)
(Gợi ý: d, e:Phần bù đến đơn vị)
tính:
a) \(2\dfrac{3}{4}.\left(-0,4\right)-1\dfrac{3}{5}.2,75+\left(-1,2\right):\dfrac{4}{11}\)
b) \(1,4.\dfrac{15}{49}-\left(\dfrac{4}{5}+\dfrac{2}{3}\right):2\dfrac{1}{5}\)
c) \(\left(-3,2\right).\dfrac{15}{64}+\left(0,8-2\dfrac{4}{15}\right):3\dfrac{2}{3}\)
d) \(0,02.\dfrac{-25}{2}+\dfrac{3}{8}+\left(-2\dfrac{9}{20}\right).\dfrac{2}{7}\)
e) \(34\%:\dfrac{51}{16}-3\dfrac{7}{9}.6,5-\left(0,4\right)^2\)
bài 1:So sánh các phân số sau:
a) \(\frac{3}{124}\);\(\frac{1}{41}\);\(\frac{5}{207}\);\(\frac{2}{83}\)
b)\(\frac{134}{43}\);\(\frac{55}{21}\);\(\frac{74}{19}\);\(\frac{116}{37}\)
c) A=\(\frac{54.107-53}{53.107+54}\)và B=\(\frac{135.269-133}{134.269+135}\)
d)\(\frac{-49}{78}\);\(\frac{64}{-95}\)