Question

1 So sánh

a) \(\dfrac{51}{56}và\dfrac{61}{66}\)

b)\(\dfrac{41}{43}và\dfrac{172}{165}\)

c)\(\dfrac{101}{506}và\dfrac{-707}{3534}\)

d) \(\dfrac{-43}{119}và\dfrac{41}{117}\)

2 Rút gọn và quy đồng

a)\(\dfrac{125}{1000};\dfrac{198}{126};\dfrac{3}{243};\dfrac{103}{3009}\)

b)\(\dfrac{1}{2};\dfrac{1}{3};\dfrac{1}{38};\dfrac{-1}{12}\)

c)\(\dfrac{9}{30};\dfrac{90}{8};\dfrac{15}{1000}\)

3 So sánh

a)\(\dfrac{-3}{5}và\dfrac{39}{65}\)

b)\(\dfrac{-9}{27}và\dfrac{11}{123}\)

c) \(\dfrac{-3}{4}và\dfrac{4}{-5}\)

d)\(\dfrac{2}{-3}và\dfrac{5}{7}\)

Answer 1

a: 51/56=1-5/56

61/66=1-5/66

mà -5/56<-5/66

nên 51/56<61/66

b: 41/43<1<172/165

c: \(\dfrac{101}{506}>0>-\dfrac{707}{3534}\)