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\(\dfrac{3}{5}+\dfrac{1}{2}-\dfrac{7}{10}=\dfrac{6}{10}+\dfrac{5}{10}-\dfrac{7}{10}=\dfrac{11}{10}-\dfrac{7}{10}=\dfrac{4}{10}=\dfrac{2}{5}\)
\(\dfrac{4}{7}:\dfrac{8}{11}=\dfrac{4}{7}\times\dfrac{11}{8}=\dfrac{44}{56}=\dfrac{11}{14}\)
a) \(\frac{5}{6}-\frac{2}{3}=\frac{5}{6}-\frac{4}{6}=\frac{1}{6}\)
b) \(\frac{11}{5}\times\frac{3}{6}=\frac{11\times3}{5\times6}=\frac{33}{30}=\frac{11}{10}\)
1/3 + 1/5 - 1/4 = 17/60
7/8 - (1/4 + 2/5) = 9/40
5/11 - (3/5 - 6/11) = 2/5
Bài 2:
a: 2/6x5/3=10/18=5/9
b: 11/9x5/10=55/90=11/18
c: 3/9x6/8=1/3x3/4=1/4
d: 4/9x12/16=48/144=1/3
e: 25/15x6/7=5/3x6/7=30/21=10/7
f: 6/10x15/20=90/200=9/20
Bài 1
4/5 x 6/7= 24/35
2/9 x 1/2= 2/18= 1/9
1/2 x 8/3= 8/6= 4/3
7/9 x 6/5= 42/45= 14/15
8/7 x 5/9= 40/63
10/11 x 22/15= 220/165= 4/3
Bài 2
2/6 x 5/3= 1/3 x 5/3=5/9
11/9 x 5/10= 11/9 x 1/2= 11/18
3/9 x 6/8= 1/3 x 3/4 =3/12= 1/4
4/9 x 12/16= 4/9 x 3/4= 12/36= 1/3
25/15 x 6/7= 5/3 x 6/7= 30/21= 10/7
6/10 x 15/20= 3/5 x 3/4= 9/20
a)
`3/5xx3/2`
`=3/5xx2/3`
`=2/5`
b)
`3/7:3/14`
`=3/7xx14/3`
`=2`
c)
`5/7xx7/10`
`=1/2`
d)
`5/11xx33/15`
`=5/11xx11/5`
`=1`
\(a,\dfrac{3}{5}:\dfrac{3}{2}=\dfrac{3}{5}\times\dfrac{2}{3}=\dfrac{6}{15}=\dfrac{2}{5}\)
\(b,\dfrac{3}{7}:\dfrac{3}{14}=\dfrac{3}{7}\times\dfrac{14}{3}=\dfrac{42}{21}=42:21=2\)
\(c,\dfrac{5}{7}\times\dfrac{7}{10}=\dfrac{35}{70}=\dfrac{1}{2}\)
\(d,\dfrac{5}{11}\times\dfrac{33}{15}=\dfrac{165}{165}=165:165=1\)
2/6*7/5=1/3*7/5=7/15.
11/9*5/10=11/9*1/2=11/18.
3/9*6/8=1/3*3/4=3/12=1/4.
bài 5
a)
`7/5xx15/14`
`=105/70=3/2`
b)
`8/15xx25/8`
`=200/120=5/3`
c)
`2/15xx5/22`
`=10/330`
`=1/33`
bài 6
chiều rộng cx là đơn vị m phải ko ạ?
diện tích căn phòng là
`11/2xx7/2=77/4(m^2)`
a) \(\dfrac{5}{11}\times\dfrac{11}{6}\)
\(=\dfrac{5\times11}{11\times6}\)
\(=\dfrac{5}{6}\)
b) \(7\times\dfrac{6}{21}\)
\(=\dfrac{7\times6}{21}\)
\(=\dfrac{6}{3}\)
\(=2\)
a: \(=\dfrac{5\cdot11}{11\cdot6}=\dfrac{5}{6}\)
b: \(=7\cdot\dfrac{2}{7}=2\)
a) 2/6 x 7/5
= 1/3 x 7/5
= 7/15
b) 11/9 x 5/10
= 11/9 x 1/2
= 11/18
c) 3/9 x 6/8
= 1/3 x 3/4
= 1/4
Chúc em học giỏi !
2/6 x 7/5 = 1/3 x 7/5 = 7/15
11/9 x 5/10 = 11/9 x 1/2 = 11/18
3/9 x 6/8 = 1/3 x 3/4 = 3/12 = 1/3
Tíck mk nha !!
\(\dfrac{11}{5}+\dfrac{5}{11}=\dfrac{11\times11+5\times5}{5\times11}=\dfrac{121+25}{55}=\dfrac{146}{55}\)