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a: 5/7=25/35
12/5=84/60
b: 2/3=30/45
4/5=36/45
8/9=40/45
a) \(\dfrac{2}{3}=\dfrac{2.8}{3.8}=\dfrac{16}{24}\)
\(\dfrac{5}{8}=\dfrac{5.3}{8.3}=\dfrac{15}{24}\)
b) \(\dfrac{1}{4}=\dfrac{1.3}{4.3}=\dfrac{3}{12}\)
\(\dfrac{7}{12}=\dfrac{7.1}{12.1}=\dfrac{7}{12}\)
c) \(\dfrac{5}{6}=\dfrac{5.4}{6.4}=\dfrac{20}{24}\)
\(\dfrac{3}{8}=\dfrac{3.3}{8.3}=\dfrac{9}{24}\)
a) 23=2.83.8=162423=2.83.8=1624
58=5.38.3=152458=5.38.3=1524
b) 14=1.34.3=31214=1.34.3=312
712=7.112.1=712712=7.112.1=712
c) 56=5.46.4=202456=5.46.4=2024
38=3.38.3=924
1/3 và 3/4
Ta có : \(\frac{1}{3}\)= \(\frac{1x4}{3x4}\)=\(\frac{4}{12}\)
\(\frac{3}{4}\)= \(\frac{3x3}{4x3}\)= \(\frac{9}{12}\)
a)\(\frac{1}{3}\)= \(\frac{1x4}{3x4}\)= \(\frac{4}{12}\)
\(\frac{3}{4}\)=\(\frac{3x3}{4x3}\)= \(\frac{9}{12}\)
b) \(\frac{3}{2}\)=\(\frac{3x21}{2x21}\)=\(\frac{63}{42}\)
\(\frac{2}{3}\)=\(\frac{2x14}{3x14}\)=\(\frac{28}{42}\)
\(\frac{5}{7}\)=\(\frac{5x6}{7x6}\)=\(\frac{30}{42}\)
a, `5/6` và `13/8` (MSC: 24)
`5/6 = (5 xx 4)/(6 xx 4) = 20/24`
`13/8 = (13 xx 3)/(8 xx 3) = 39/24`
b, `4/15` và `5/72` (MSC: 360)
`4/15 = (4 xx 24)/(15 xx 24) = 96/360`
`5/72 = (5 xx 5)/(72 xx 5) = 25/360`.
Bài 2:
a: 2/5=14/35
3/7=15/35
b: -3/4=-9/12
-7/-12=7/12
c: 5/9=60/108
-11/-12=11/12=99/108
d: -4/7=-36/63
8/9=56/63
-10/21=-30/63
Bài 2:
a: 2/5=14/35
3/7=15/35
b: -3/4=-9/12
-7/-12=7/12
c: 5/9=60/108
-11/-12=11/12=99/108
d: -4/7=-36/63
8/9=56/63
-10/21=-30/63
bài3
1. \(\frac{4}{3}\)= \(\frac{4x4}{3x4}\)=\(\frac{20}{12}\)
\(\frac{3}{4}\)=\(\frac{3x3}{4x3}\)=\(\frac{9}{12}\)
2.\(\frac{5}{4}\)=\(\frac{5x6}{4x6}\)=\(\frac{30}{24}\)
\(\frac{5}{6}\)=\(\frac{5x4}{6x4}\)=\(\frac{20}{24}\)
3.\(\frac{3}{8}\)=\(\frac{3x6}{8x6}\)=\(\frac{18}{48}\)
\(\frac{1}{6}\)=\(\frac{1x6}{6x8}\)=\(\frac{6}{48}\)
4.\(\frac{2}{5}\)=\(\frac{2x7}{5x7}\)=\(\frac{14}{35}\)
\(\frac{4}{7}\)=\(\frac{4x5}{7x5}\)=\(\frac{20}{35}\)
\(a) {4\over12}={4.5\over12.5}={20\over60}\)
\({1\over5}={1.12\over5.12}={12\over60}\)
\({-4\over15}={-4.4\over15.5}={-16\over60}\)
b)\({-7\over10}={-7.3\over10.3}={-21\over20}\)
\({1\over2}={1.15\over2.15}={15\over30}\)
\({-4\over15}={-4.2\over15.2}={-8\over30}\)
c)\({-5\over14}={-5.30\over14.30}={-150\over420}\)
\({3\over20}={3.21\over20.21}={63\over420}\)
\({-4\over21}={-4.20\over21.20}={-80\over420}\)
d)\({4\over18}={4.5\over18.5}={20\over90}\)
\({1\over18}={1.18\over5.18}={18\over90}\)
\({-6\over15}={-6.6\over15.6}={-36\over90}\)
Nói lời giữ lời nha ^_^..........Mệt wá........
a)4/12=1.5/12.5=5/60
1/5=1.12/5.12=5/60
-4/15=-4.4/15.4=-16/60
b)-7/10=-7.3/10.3=-21/30
1/2=1.15/2.15=15/30
-4/15=-4.2/15.2=-8/30
c)-5/14=-5.30/14/30=150/420
3/20=3.21/20.21=63/420
-4/21=-4.20/21.20=-80/420
d)4/18=4.5/18.5=20/90
1/5=1.18/5.18=18/90
-6/15=-6.6/15.6=-36/90
\(\dfrac{3}{4}\) = \(\dfrac{3.5}{4.5}\) = \(\dfrac{15}{20}\); \(\dfrac{4}{5}=\dfrac{4.4}{5.4}\) = \(\dfrac{16}{20}\)
\(\dfrac{4}{7}\) = \(\dfrac{4.9}{7.9}\) = \(\dfrac{36}{63}\); \(\dfrac{5}{9}\) = \(\dfrac{5.7}{9.7}\) = \(\dfrac{35}{63}\)
\(\dfrac{5}{12}\) = \(\dfrac{5.3}{12.3}\) = \(\dfrac{15}{36}\); \(\dfrac{4}{9}=\dfrac{4.4}{9.4}\) = \(\dfrac{16}{36}\)
\(\dfrac{7}{9}=\dfrac{7.8}{9.8}\) = \(\dfrac{56}{72}\) ; \(\dfrac{5}{8}\) = \(\dfrac{5.9}{8.9}\) = \(\dfrac{45}{72}\)
