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\(\frac{2}{3}\times\frac{1}{5}+\frac{3}{10}\times\frac{2}{3}+\frac{4}{6}\times\frac{1}{2}\)
\(=\frac{2}{3}\times\frac{1}{5}+\frac{3}{10}\times\frac{2}{3}+\frac{2}{3}\times\frac{1}{2}\)
\(=\frac{2}{3}\times\left(\frac{1}{5}+\frac{3}{10}+\frac{1}{2}\right)\)
\(=\frac{2}{3}\times\frac{10}{10}\)
\(=\frac{2}{3}\)
2/3 x 3/4 x 4/5 : 1/5 = 6/12 x 4/5 :1/5 = 24/60 :1/5 = 4/10 : 1/5 = 4/10 x 5/1 = 20/10 = 2
2/5 x 3/4 x 5/6 : 3/4 = 6/20 x 5/6 : 3/4 = 3/10 x 5/6 : 3/4 = 15/60 : 3/4 = 1/4 : 3/4 = 1/4 x 4/3 = 4/12 = 1/3
k cho mk nha!
45 x 77 + 9 x 22 x 5 + 45
= 45 x 77 + 45 x 22 + 45
= 45 x (77 + 22 + 1)
= 45 x 100
= 4500
k mik nhé
5/7 : 2/3 = 5/7 x 3/2 = 15/14
9/11 : 8 /13 = 9/11 x 13/8 = 117/88
1/8 : 1/6 = 1/8 x 6 = 3/4
4/15 : 7/30 = 4/15 x 30/7 = 8/7
\(\frac{5}{7}:\frac{2}{3}=1\frac{1}{14}\) \(\frac{9}{11}:\frac{8}{13}=1\frac{29}{88}\)
\(\frac{1}{8}:\frac{1}{6}=\frac{3}{4}\) \(\frac{4}{15}:\frac{7}{30}=1\frac{1}{7}\)\(k\)\(nha\)\(!!!!!!!!!!!!!!\)
a; 60 \(\times\) (\(\dfrac{7}{12}\) + \(\dfrac{4}{15}\))
= 60 \(\times\) \(\dfrac{7}{12}\) + 60 \(\times\) \(\dfrac{4}{15}\)
= 35 + 16
= 51
a,\(60\times\left(\frac{7}{12}+\frac{4}{15}\right)\)\(=\frac{60\times7}{12}+\frac{60\times4}{15}\)
\(=\frac{12\times5\times7}{12}+\frac{15\times4\times4}{15}\)
\(=5\times7+4\times4\)
\(=35+16\)
\(=51\)
b, \(\frac{1}{2}\times\frac{2}{3}\times\frac{3}{4}\times...\times\frac{8}{9}\)\(=\frac{1\times2\times3\times4\times5\times6\times7\times8}{2\times3\times4\times5\times6\times7\times8\times9}\)
\(=\frac{1}{9}\)
2/3 +5/9 - 3/4 =17/36
2/7 :2/3 -1/7 = 2/7
2/5 * 1/4 :3/8 = 4/15 nha bạn
X × 2 + X × 3 + X × 4 + X = 2130.
= X × 2 + X × 3 + X × 4 + X × 1 = 2130
= X × ( 2 + 3 + 4 + 1 ) = 2130
= X × 10 = 2130
X = 2130 : 10
X = 213
HT NHA
2/3 x 1/6 x 9/11
= 1/9 x 9/11
= 1/11
1/11 nhé bn tk mk nhé mk sẽ kb