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\(\dfrac{5}{12}=\dfrac{5.4}{12.4}=\dfrac{20}{48}\)
\(\dfrac{3}{16}=\dfrac{3.3}{16.3}=\dfrac{9}{48}\)
MTC : 48
\(\dfrac{5}{12}=\dfrac{20}{48}\)
\(\dfrac{3}{16}=\dfrac{9}{48}\)
Câu 1:
MSC=60
7/10=7.6/10.6=42/60 5/-12=-5/12=-5.5/12.5=-25/60
Câu 2:
17/34=1/2; -12/22=-6/11; -25/35=-5/7; 125/75=5/3
Câu 3:
MSC=24
1/3=1.8/3.8=8/24 -3/8=-3.3/8.3=-9/24 17/24=17/24
`5/12=(5xx5)/(12xx5)=25/60`
`(-11)/15=(-11xx4)/(15xx4)=(-44)/60`
`49/(-60)=(-49)/60`
MSC: 60
\(\dfrac{5}{12}=\dfrac{5.5}{12.5}=\dfrac{25}{60}\)
\(\dfrac{-11}{15}=\dfrac{-11.4}{15.4}=\dfrac{-44}{60}\)
\(\dfrac{49}{-60}=\dfrac{-49}{60}\)
a; \(\dfrac{-12}{30}\) = \(\dfrac{-2}{5}\) = \(\dfrac{-2.4}{5.4}\) = \(\dfrac{-8}{20}\)
\(\dfrac{18}{-40}\) = \(\dfrac{9}{20}\)
b; \(\dfrac{-12}{81}\) = \(\dfrac{-4}{27}\); \(\dfrac{36}{64}\) = \(\dfrac{9}{16}\); \(\dfrac{25}{-10}\) = \(\dfrac{-5}{2}\)
27 = 33; 16 = 24; 2 = 2
BCNN(27; 16; 2) = 24.33= 432
\(\dfrac{-12}{81}\) = \(\dfrac{-4}{27}\) = \(\dfrac{-4.16}{27.16}\) = \(\dfrac{-64}{432}\)
\(\dfrac{36}{64}\) = \(\dfrac{9}{16}\) = \(\dfrac{9.27}{16.27}\) = \(\dfrac{243}{432}\)
\(\dfrac{25}{-10}\) = \(\dfrac{-5}{2}\)= \(\dfrac{-5.216}{2.216}\) = \(\dfrac{-1080}{432}\)
Ta có: \(\dfrac{5}{7} = \dfrac{{5.4}}{{7.4}} = \dfrac{{20}}{{28}}\) và \(\dfrac{{ - 3}}{4} = \dfrac{{ - 3.7}}{{4.7}} = \dfrac{{ - 21}}{{28}}\)
Như vậy, \(\dfrac{{20}}{{28}} + \dfrac{{ - 21}}{{28}} = \dfrac{{20 + \left( { - 21} \right)}}{{28}} = \dfrac{-1}{{28}}\)
a ) 1 2 < 5 6 b ) 4 7 > 5 9 ; c ) − 3 7 > − 4 9 d ) − 7 8 < 35 − 42
đéo biết
đã đc kĩ chx mè đã bảo k bt rou