Nối hai phân số bằng nhau:
3/4 3/7 1và5/7 20/28
24/14 15/20 5/7 15/32
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\(\frac{2}{5}\Leftrightarrow\frac{14}{35}\)
\(\frac{18}{48}\Leftrightarrow\frac{3}{8}\)
\(\frac{4}{7}\Leftrightarrow\frac{20}{35}\)
Bài 1:
a: -8/12<0<-3/-4
b: -56/24<0<7/3
c: 4/25<1<15/13
=>-4/25>-15/13
Bài 2:
a: =-60/45=-4/3
b: =4/15-3/2-8/5=8/30-45/30-48/30=-85/30=-17/6
\(\dfrac{14}{21}=\dfrac{2}{3}\\ \dfrac{12}{15}=\dfrac{8}{10}\\ \dfrac{5}{7}=\dfrac{20}{28}\\ \dfrac{18}{33}=\dfrac{6}{11}\)
a, 5/4 , 14/21 , 12/15 , 5/7 , 18/33
b, 20/28 , 15/12 , 6/11 , 2/3 , 8/10
14/21=2/3
20/28=5/7
18/33=6/11
Bài 1:
a) \(\dfrac{-5}{6}\ne\dfrac{10}{-14}\left(\dfrac{10}{-14}=-\dfrac{5}{7}\right).\)
b) \(\dfrac{-15}{-60}\ne\dfrac{-3}{12}\left(\dfrac{-15}{-60}=\dfrac{1}{4}\right).\)
Bài 2:
a) \(\dfrac{20}{-140}=-\dfrac{1}{7}.\)
b) \(\dfrac{4.18}{9.12}=\dfrac{72}{108}=\dfrac{2}{3}.\)
c) \(\dfrac{17.25-17.3}{2.\left(-15\right)}=\dfrac{17.\left(25-3\right)}{-30}=-\dfrac{17.22}{30}=\dfrac{374}{30}=\dfrac{187}{15}.\)
Bài 3:
a) \(\dfrac{-3}{5}< \dfrac{4}{-7}.\)
b) \(\dfrac{-4}{21}>\dfrac{-7}{35}.\)
c) \(\dfrac{-7}{24}>\dfrac{-2}{3}.\)
d) \(\dfrac{-52}{167}< \dfrac{-3}{-4}.\)
1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20+21+22+23+24+25+26+27+28+29+30+31+32+33+34+35+36+37
=(1+37)x37:2
=703