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\(\frac{36\times45}{6\times5}=\frac{6\times6\times5\times9}{6\times5}=6\times9=54\)
cách 1: 9/5:17/15 + 8/5:17/15=27/17+24/17=3
cách 2 :9/5:17/15+8/5:17/15=17/15 x15/17+8/5 x15/17=15/17 x (9/5+8/5)=15/17 x 17/5 = 3
\(45\times128-90\times64\)
\(=45\times2\times64-90\times64\)
\(=90\times64-90\times64\)
\(=0\)
~ Hok tốt ~
45 x 128 - 90 x 64
= ( 45 x 128 ) - ( 90 x 64 )
= 5760 - 5760
= 0
Cách 1:
\(\frac{5}{12}:\frac{2}{5}+\frac{7}{12}:\frac{2}{5}-\frac{1}{3}:\frac{2}{5}\)
\(=\frac{5}{12}\times\frac{5}{2}+\frac{7}{12}\times\frac{5}{2}-\frac{1}{3}\times\frac{5}{2}\)
\(=\frac{25}{24}+\frac{35}{24}-\frac{5}{6}\)
\(=\frac{25}{24}+\frac{35}{24}-\frac{20}{24}\)
\(=\frac{5}{3}\)
Cách 2.
\(\frac{5}{12}:\frac{2}{5}+\frac{7}{12}:\frac{2}{5}-\frac{1}{3}:\frac{2}{5}\)
\(=\frac{5}{12}\times\frac{5}{2}+\frac{7}{12}\times\frac{5}{2}-\frac{1}{3}\times\frac{5}{2}\)
\(=\left(\frac{5}{12}+\frac{7}{12}-\frac{1}{3}\right)\times\frac{5}{2}\)
\(=\left(1-\frac{1}{3}\right)\times\frac{5}{2}\)
\(=\left(\frac{3}{3}-\frac{1}{3}\right)\times\frac{5}{2}\)
\(=\frac{2}{3}\times\frac{5}{2}\)
\(=\frac{5}{3}\)
Linz
Cách 1 :
85,35 : 5 + 63,05 : 5
= 17,07 + 12,61
= 29,68
Cách 2 :
85,35 : 5 + 63,05 : 5
= ( 85,35 + 63,05 ) : 5
= 148,4 : 5
= 29,68
Cách 1 :
85,35 : 5 + 63,05 : 5 = 17,07 + 12,61 .
= 29,68 .
Cách 2 :
85,35 : 5 + 63,05 : 5 = ( 85,35 + 63,05 ) : 5 .
= 148,4 :5 .
= 29,68 .
83 : 25 + 38 : 25
= (83 + 38) : 25
= 121 : 25
= 4,84
92:36- 29:36
= (92 - 29) : 36
= 63 : 36
= 1,75
83 : 25 + 38 : 25
= (83 + 38) : 25
= 121 : 25
= 4,84 bạn ơi hình như bạn chép sai rùi
92 : 36 - 29 : 26 : 26
= ( 92 - 29 ) : 26
= 2.423076923076923
\(\frac{9}{5}:\frac{17}{15}+\frac{8}{5}:\frac{17}{15}\)
\(=\frac{17}{15}:\left(\frac{9}{5}+\frac{8}{5}\right)\)
\(=\frac{17}{15}:3\)
\(=\frac{17}{45}\)
\(\frac{9}{5}:\frac{17}{15}+\frac{8}{5}:\frac{17}{5}=\frac{9}{5}.\frac{15}{17}+\frac{8}{5}.\frac{15}{17}=\frac{15}{17}\left(\frac{9}{5}+\frac{8}{5}\right)=\frac{15}{17}.\frac{17}{5}=3\)
cách 1 chăc ai cũng biêt mình giải cách 2 nha:ta co =(64+36):5=100:5=20
Cách 1:
64:5+36:5
=12.8+7.2
=20
Cách 2:
64:5+36:5
=(64+36):5
=100:5
=20