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\(a,\frac{2}{7}:\frac{4}{5}=\frac{2}{7}\times\frac{5}{4}=\frac{10}{28}=\frac{5}{14}\)
\(b,\frac{3}{8}:\frac{9}{4}=\frac{3}{8}\times\frac{4}{9}=\frac{12}{72}=\frac{1}{6}\)
\(c,\frac{8}{21}:\frac{4}{7}=\frac{8}{21}\times\frac{7}{4}=\frac{56}{84}=\frac{2}{3}\)
\(d,\frac{5}{8}:\frac{15}{8}=\frac{5}{8}\times\frac{8}{15}=\frac{40}{120}=\frac{1}{3}\)
A,\(\frac{2}{7}:\frac{4}{5}=\frac{2}{7}\times\frac{5}{4}=\frac{10}{28}=\frac{5}{14}\)
B,\(\frac{3}{8}:\frac{9}{4}=\frac{3}{8}\times\frac{4}{9}=\frac{12}{72}=\frac{1}{6}\)
C.\(\frac{8}{21}:\frac{4}{7}=\frac{8}{21}\times\frac{7}{4}=\frac{56}{84}=\frac{2}{3}\)
D.\(\frac{5}{8}:\frac{15}{8}=\frac{5}{8}\times\frac{8}{15}=\frac{40}{120}=\frac{1}{3}\)
Đúng 100%
a) 3/5:3/4=3/5x4/3=(3x4)/(5x3)=12/15=4/5
b)2/5:3/10=2/5x10/3=(2x10)/(5x3)=20/15=4/3
c)9/8:3/4=9/8x4/3=(9x4)/(8x3)=36/32=9/8
d)1/4:1/2=1/4x2=2/4=1/2
e)1/8:1/6=1/8x6=6/8=3/4
g)1/5:1/10=1/5x10=10/5=2
a)3/5:3/4=12/15=4/5
2/5:3/10=20/15=4/3
9/8:3/4= 32/24=4/3
b)1/4:1/2=2/4=1/2
1/8:1/6=6/8=3/4
1/5:1/10=10/5=2/1=2
kích cho mình nha
A. C1: (6/11 + 5/11) x 3/7 = 1 x 3/7 = 3/7
C2: (6/11 + 5/11) x 3/7 = 6/11 x 3/7 + 5/11 x 3/7 = 18/77 + 15/77 = 3/7
a)Cách 1:
(6/11+5/11)x3/7
=11/11x3/7
=1x3/7
=3/7
Cách 2:
(6/11+5/11)x3/7
=6/11x3/7+5/11x3/7
=18/77 + 15/77
=33/77
=3/7 (mink đã rút gọn)
k nhé
a) \(\frac{1}{5}:\frac{2}{15}=\frac{1}{5}\times\frac{15}{2}\)
\(=\frac{15}{10}=\frac{3}{2}\)
b)\(\frac{3}{7}:\frac{9}{14}=\frac{3}{7}\times\frac{14}{9}\)
\(=\frac{42}{63}=\frac{2}{3}\)
c) \(\frac{7}{12}:\frac{21}{24}=\frac{7}{12}\times\frac{24}{21}\)
\(=\frac{168}{252}=\frac{2}{3}\)
d) \(\frac{9}{13}:\frac{27}{26}=\frac{9}{13}\times\frac{26}{27}\)
\(=\frac{234}{351}=\frac{2}{3}\)
k nha
A/ 15/10 = 3/2
B/ 42/63 = 2/3
C/ 168/252 = 2/3
D/ 234/351 = 2/3
a) cách1 a) 3/5x7/9-3/5x2/9
=7/15-2/15
=1/3
cách 2 3/5x7/9-3/5x2/9
=3/5x(7/9-2/9)
=3/5x5/9
=1/3
a/ C1:
\(\frac{3}{5}\times\frac{7}{9}-\frac{3}{5}\times\frac{2}{9}=\frac{3}{5}\times\left(\frac{7}{9}-\frac{2}{9}\right)=\frac{3}{5}\times\frac{5}{9}=\frac{1}{3}\)
C2:
\(\frac{3}{5}\times\frac{7}{9}-\frac{3}{5}\times\frac{2}{9}=\frac{7}{15}-\frac{2}{15}=\frac{1}{3}\)
b/ C1:\(\left(\frac{6}{7}-\frac{4}{7}\right):\frac{2}{5}=\frac{2}{7}:\frac{2}{5}=\frac{5}{7}\)
C2: \(\frac{6}{7}:\frac{2}{5}-\frac{4}{7}:\frac{2}{5}=\frac{15}{7}-\frac{10}{7}=\frac{5}{7}\)
c/ C1: \(\frac{8}{15}:\frac{2}{11}+\frac{7}{15}:\frac{2}{11}=\frac{44}{15}+\frac{77}{30}=\frac{11}{2}\)
C2: \(\left(\frac{8}{15}+\frac{7}{15}\right):\frac{2}{11}=1:\frac{2}{11}=\frac{11}{2}\)
a)cách 1
=8/15 x 1/2
=8/30
cách 2
=1/3 x 1/2 + 1/5 x 1/2
=1/6 + 1/10
=8/30
b) cách 1
=2/.15 x 1/2
=2/30
cách 2
=1/3 x 1/2 - 1/5 x 1/2
=1/6 - 1/10
=2/30
nhớ tk nha
\(\dfrac{7}{15}+\dfrac{4}{5}=\dfrac{7}{15}+\dfrac{12}{15}=\dfrac{19}{15}\)
\(\dfrac{2}{3}-\dfrac{3}{8}=\dfrac{16}{24}-\dfrac{9}{24}=\dfrac{7}{24}\)
\(\dfrac{4}{7}.\dfrac{21}{16}:\dfrac{5}{8}=\dfrac{4}{7}.\dfrac{21}{16}.\dfrac{8}{5}=\dfrac{4.3.7.4.2}{7.4.4.5}=\dfrac{6}{5}\)
A)2/7:4/5=2/7*5/4=10/28=5/14
b)3/8:9/4=3/8*4/9=12/72=1/6
c)8/21:4/7=8/21*7/4=56/84=2/3
D)5/8:15/8=5/8*8/15=40/120=1/3
k nha