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\(\frac{9}{5}:\frac{17}{15}+\frac{8}{5}:\frac{17}{15}=\frac{9}{5}.\frac{15}{17}+\frac{8}{5}.\frac{15}{17}=\frac{15}{17}.\left(\frac{9}{5}+\frac{8}{5}\right)=\frac{15}{17}.\frac{17}{5}=\frac{15}{5}=3\)
0,9:0,25+1,05:0,25 = 0,9.4+1,05.4 = 4.(0,9+1,05)=4 . 1,95=7,8
a, 9/5 : 17.15 + 8/5 : 17/15 = b, 0,9 : 0,25 + 1,05 : 0,25 =
Cách 1: = 27/17 + 24/17 Cách 1: = 3,6 + 4,2
= 3 7,8
Cách 2: = (9/5 + 8/5) : 17/15 Cách 2: = (0,9 + 1 ,05) : 0,25
= 17/5 : 17/15 = 1,95 : 0,25
= 3 = 7,8
a, 9/5 : 17/15 + 8/5 : 17/15 = 27/17 + 24/17 = 3
9/5 : 17/15 + 8/5 : 17/15 = ( 9/5 + 8/5 ) : 17/15
= 17/5 : 17/15 = 3
b, 0,9 : 0,25 + 1,05 : 0 ,25 = 3,6 + 4,2 = 7,8
0 ,9 : 0,25 + 1,05 : 0 ,25 = ( 0,9 + 1,05 ) : 0 ,25
= 1,95 : 0 25 = 7,8
A) Cách 1 : 9/5 : 17/15 + 8/5 : 17/15 = ( 9/5 + 8/5 ) : 17/15
= 17/5 : 17/15
= 3
Cách 2 : 9/5 : 17/15 + 8/5 : 17/15 = 27/17 + 24/17
= 3
B ) Cách 1 : 0,9 : 0,25 + 1,05 : 0,25 = ( 0,9 + 1,05 ) : 0,25
= 1,95 : 0,25
= 7,8
Cách 2 : 0,9 : 0,25 + 1,05 : 0,25 = 3,6 + 4,2
= 7,8
k mình nhé mình trả lời nhanh nhất , đầy đủ nhất và đúng nhất
Bài giải
\(\frac{2}{3}+\frac{3}{4}+\frac{4}{5}=\frac{40}{60}+\frac{45}{60}+\frac{48}{60}=\frac{133}{60}\)
\(\frac{8}{5}+\frac{7}{6}+\frac{10}{9}+\frac{1}{2}=\frac{144}{90}+\frac{105}{90}+\frac{100}{90}+\frac{45}{90}=\frac{394}{90}\)
\(\frac{15}{17}-\frac{11}{13}+\frac{3}{26}=\frac{390}{442}+\frac{374}{442}+\frac{51}{442}=\frac{815}{442}\)
\(\frac{9}{12}\text{ x }\frac{4}{3}\text{ : }\frac{8}{5}=\frac{9}{12}\text{ x }\frac{4}{3}\text{ x }\frac{5}{8}=\frac{9\text{ x }4\text{ x }5}{12\text{ x }3\text{ x }8}=\frac{5}{8}\)
\(\frac{4}{5}\text{ x }\frac{15}{8}\text{ : }\frac{5}{7}=\frac{4}{5}\text{ x }\frac{15}{8}\text{ x }\frac{7}{5}=\frac{4\text{ x }15\text{ x }7}{5\text{ x }8\text{ x }5}=\frac{21}{10}\)
\(\frac{2}{3}+\frac{3}{4}+\frac{4}{5}=\frac{40}{60}+\frac{45}{60}+\frac{48}{60}=\frac{133}{60}\)
\(\frac{8}{5}+\frac{7}{6}+\frac{10}{9}+\frac{1}{2}=\frac{144}{90}+\frac{105}{90}+\frac{100}{90}+\frac{45}{90}=\frac{197}{45}\)
\(\frac{15}{17}-\frac{11}{13}+\frac{1}{26}=\frac{390}{442}+\frac{374}{442}+\frac{51}{442}=\frac{815}{442}\)
\(\frac{9}{12}\times\frac{4}{3}:\frac{8}{5}=1:\frac{8}{5}=\frac{5}{8}\)
\(\frac{4}{5}\times\frac{15}{8}:\frac{5}{7}=\frac{3}{2}:\frac{5}{7}=\frac{21}{10}\)
\(204,40:48=4,26\)
Tính bằng hai cách:
Cách 1:
\(0,9\div0,25+1,05\div0,25\)
\(=3,6+4,2\)
\(=7,8\)
Cách 2:
\(0,9\div0,25+1,05\div0,25\)
\(=\left(0,9+1,05\right)\div0,25\)
\(=1,95\div0,25\)
\(=7,8\)
\(\frac{5}{9}\times\frac{12}{7}=\frac{5\times12}{9\times7}=\frac{5\times4\times3}{3\times3\times7}=\frac{20}{21}\)
\(\frac{6}{5}:\frac{8}{3}=\frac{6}{5}\times\frac{8}{3}=\frac{2\times3\times8}{5\times3}=\frac{16}{5}\)
\(\frac{9}{20}\times\frac{5}{12}=\frac{3\times3\times5}{4\times5\times4\times3}=\frac{3}{16}\)
\(\frac{15}{16}:\frac{25}{24}=\frac{15}{16}\times\frac{24}{25}=\frac{3\times5\times4\times2\times3}{4\times2\times2\times5\times5}=\frac{9}{10}\)
\(14\times\frac{5}{21}=\frac{2\times7\times5}{3\times7}=\frac{10}{3}\)
\(10:\frac{5}{3}=10\times\frac{3}{5}=\frac{2\times5\times3}{5}=6\)
\(\frac{5}{3}:10=\frac{5}{3}\times\frac{1}{10}=\frac{5}{3\times2\times5}=\frac{1}{6}\)
A) cách 1\(\frac{9}{5}:\frac{17}{15}+\frac{8}{5}:\frac{17}{15}\)
\(=\frac{9}{5}\cdot\frac{15}{17}+\frac{8}{5}\cdot\frac{15}{17}\)
\(=\frac{135}{85}+\frac{120}{85}\)
\(=\frac{255}{85}\)
\(=3\)
Cách 2\(\frac{9}{5}:\frac{17}{15}+\frac{8}{5}:\frac{17}{15}\)
\(=\frac{9}{5}\cdot\frac{15}{17}+\frac{8}{5}\cdot\frac{15}{17}\)
\(=\frac{15}{17}\cdot\left(\frac{9}{5}+\frac{8}{5}\right)\)
=\(\frac{15}{17}\cdot\frac{17}{5}\)
\(=\frac{15\cdot17}{17\cdot5}\)
\(=\frac{5\cdot3\cdot17}{17\cdot5}\)
\(=3\)
B) Cách 1 :
0,9 : 0,25 + 1,05 : 0,25
= 3,6 + 4,2
=7,8
Cách 2:
0,9 : 0,25 + 1,05 : 0,25
\(=0,9:\frac{1}{4}+1,05:\frac{1}{4}\)
\(=0,9\cdot4+1,05\cdot4\)
\(=4\cdot\left(0,9+1,05\right)\)
\(=4\cdot1,95\)
=\(7,8\)