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\(\frac{9}{5}:\frac{17}{15}+\frac{8}{5}:\frac{17}{15}\)
\(=\frac{9}{5}\times\frac{15}{17}+\frac{8}{5}\times\frac{15}{17}\)
\(=\frac{15}{17}\times\left(\frac{9}{5}+\frac{8}{5}\right)\)
\(=\frac{15}{17}\times\frac{17}{5}\)
\(=3\)
h minh nhen
9/5 : 17/15 + 8/5 : 17/15
= 27/17 + 24/17
= 3
cách 2
( 9/5 + 8/5 ) : 17/15
=17/5 : 17/15
= 3
0,9 : 0,25 + 1,05 : 0,25
= 3,6 + 4,2
= 7,8
cách 2
0,9 : 0,25 + 1,05 : 0,25
= ( 0,9 + 1,05 ) : 0,25
= 1,95 : 0,25
= 7,8
a)
C1: 9/5 : 17/15 + 8/5 : 17/15
= 27/17 + 14/17
= 3
C2: 9/5 : 17/15 + 8/5 : 17/15
= ( 9/5 + 8/5 ) : 17/15
= 17/5 : 17/15
= 3
b)
C1: 0,9 : 0,25 + 1.05 : 0,25
= 3,6 + 4,2
= 7,8
C2: 0,9 : 0,25 + 1,05 : 0,25
= ( 0,9 + 1,05) : 0,25
= 1,95 : 0,25
= 7,8
9/5:17/15+8/5:17/15
c1:=17/15:(9/5+8/5)
=17/15:17/5=1
c2=27/17+24/17
=51/17
a,(11/15+4/15)+(5/7+2/7)
=1+1
=2
b,5/9x(1/2+6/4)
=5/9x2
=10/9
c,1/2:(7/8+9/8)
=1/2:2
=1
d,(17/10-7/10)+1/2
=1+1/2
=3/2
a) \(\frac{11}{15}+\frac{5}{7}+\frac{2}{7}+\frac{4}{15}=\left(\frac{11}{15}+\frac{4}{15}\right)+\left(\frac{5}{7}+\frac{2}{7}\right)\)
\(=2\)
b) \(\frac{5}{9}\times\frac{1}{2}\times\frac{5}{9}\times\frac{6}{4}=\frac{25}{81}\times\frac{3}{4}=\frac{25}{108}\)
c) \(\frac{7}{8}\div\frac{1}{2}+\frac{9}{8}\div\frac{1}{2}=\left(\frac{7}{8}+\frac{9}{8}\right)\div\frac{1}{2}\)
\(=2\div\frac{1}{2}=4\)
d) \(\frac{17}{10}+\frac{1}{2}-\frac{7}{10}=\left(\frac{17}{10}-\frac{7}{10}\right)+\frac{1}{2}\)
\(=1+\frac{1}{2}=\frac{3}{2}\)
a) \(\frac{11}{15}+\frac{5}{7}+\frac{2}{7}+\frac{4}{15}\)
\(=\left(\frac{11}{15}+\frac{4}{15}\right)+\left(\frac{5}{7}+\frac{2}{7}\right)\)
\(=1+1\)
\(=2\)
b) \(\frac{5}{9}.\frac{1}{2}.\frac{5}{9}.\frac{6}{4}\)
\(=\left(\frac{5}{9}\right)^2\left(\frac{1}{2}.\frac{6}{4}\right)\)
\(=\frac{25}{81}.\frac{3}{4}\)
\(=\frac{25}{108}\)
c) \(\frac{7}{8}:\frac{1}{2}+\frac{9}{8}:\frac{1}{2}\)
\(=\frac{7}{8}.2+\frac{9}{8}.2\)
\(=2\left(\frac{7}{8}+\frac{9}{8}\right)\)
\(=2.\frac{16}{8}\)
\(=2.2\)
\(=4\)
d) \(\frac{17}{10}+\frac{1}{2}-\frac{7}{10}\)
\(=\left(\frac{17}{10}-\frac{7}{10}\right)+\frac{1}{2}\)
\(=1+\frac{1}{2}\)
\(=\frac{2}{2}+\frac{1}{2}\)
\(=\frac{3}{2}\)
a) C1:
=27/17 + 24/17
=3
C2:
= (9/5 + 8/5) : 17/15
=17/5 : 17/15 =3
b) C1:
=3,6 + 4,2 = 7,8
C2:
=(0,9 + 1,05): 0,25 = 1,95 : 0,25=7,8
a) \(\frac{9}{5}:\frac{17}{15}+\frac{8}{5}:\frac{17}{15}=\left(\frac{9}{5}+\frac{8}{5}\right):\frac{17}{15}=\frac{17}{5}:\frac{17}{15}=\frac{17}{5}.\frac{15}{17}=\frac{15}{5}=3\)
\(\frac{9}{5}:\frac{17}{15}+\frac{8}{5}:\frac{17}{15}=\frac{9}{5}.\frac{15}{17}+\frac{8}{5}.\frac{15}{17}=\frac{27}{17}+\frac{24}{17}=\frac{51}{17}=3\)
b) 0,9 : 0,25 + 1,05 : 0,25 = ( 0,9 + 1,05 ) : 0,25 = 1,95 : 0,25 = 7,8
0,9 : 0,25 + 1,05 : 0,25 = 3,6 + 4,2 = 7,8