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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, \(\frac{1}{2}\times\frac{2}{3}\times\frac{3}{4}\times...\times\frac{8}{9}\)\(=\frac{1\times2\times3\times4\times5\times6\times7\times8}{2\times3\times4\times5\times6\times7\times8\times9}\)
\(=\frac{1}{9}\)
5/9x12/7=20/21
6/5:8/3=9/20
9/20x5/12=3/16
15/16:25/24=9/10
14x5/21=10/3
10:5/3=6
5/3:10=1/6
5/9 x 12/7 = 60/63
6/5 : 8/3 = 6/5 x 3/8 = 9/20
9/20 x 5/12 = 3/16
15/16 : 25/24 = 15/16 x 24/25 = 9/10
14 x 5/21 = 60/21
10 : 5/3 = 10 x 3/5 = 6
5/3 : 10 = 5/3 x 1/10 = 1/6
a)\(\frac{3}{5}+\frac{4}{7}=\frac{21}{35}+\frac{20}{35}=\frac{41}{35}\)
b)\(\frac{2}{3}-\frac{3}{9}=\frac{2}{3}-\frac{1}{3}=\frac{1}{3}\)Hoặc \(\frac{2}{3}-\frac{3}{9}=\frac{6}{9}-\frac{3}{9}=\frac{3}{9}=\frac{1}{3}\)
c)\(\frac{2}{5}\)x\(\frac{8}{11}=\frac{16}{55}\)
d)\(\frac{3}{7}:\frac{6}{14}=\frac{3}{7}\)x\(\frac{14}{6}=\)\(\frac{3x7x2}{7x3x2}\)\(=\)\(1\)
e)\(\frac{3}{8}+\frac{6}{15}:\frac{3}{5}=\frac{3}{8}+\frac{6}{15}\)x\(\frac{5}{3}=\frac{3}{8}+\)\(\frac{2}{3}\)\(=\frac{9}{24}+\frac{16}{24}=\frac{25}{24}\)
Giải cực kì đầy đủ
Bài 1
a 2/5+3/6=12/30+15/30=27/30=9/10 .
b 5/9-1/6=30/54-9/54=21/54=7/18
a) 2/5 + 1/2 + 7/10
= 4/10 + 5/10 + 7/10
= 9/10 + 7/10
= 16/10 = 8/5
b) 4/9 + 11/8 - 5/6
= 32/72 + 99/72 - 60/72
= 191/72
c) 9/20 - 8/15 x 5/12
= 9/20 - 2/9
= 41/180
d) 2/3 : 4/5 : 7/12
= 5/6 : 7/12
= 10/7
rút gọn phân số :
4/5+21/15=4/5+7/5=11/5
8/9-25/45=8/9-5/9=3/9
tính :
5/6+2/7+15/6=5/6+15/6+2/7
=10/3+2/7=76/21
7/8-9/6.7/8=7/8-21/16=-7/16
chúc bạn học tốt !!!
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
\(\frac{5}{7}:\frac{2}{3}=1\frac{1}{14}\) \(\frac{9}{11}:\frac{8}{13}=1\frac{29}{88}\)
\(\frac{1}{8}:\frac{1}{6}=\frac{3}{4}\) \(\frac{4}{15}:\frac{7}{30}=1\frac{1}{7}\)\(k\)\(nha\)\(!!!!!!!!!!!!!!\)
\(\frac{9}{14}\times\frac{7}{6}=\frac{9\times7}{14\times6}=\frac{3}{4}\)
\(\frac{5}{9}:\frac{10}{21}=\frac{5}{9}\times\frac{21}{10}=\frac{7}{6}\)
\(\frac{8}{15}+\frac{4}{15}:\frac{2}{5}=\frac{8}{15}+\frac{4}{15}\times\frac{5}{2}=\frac{8}{15}+\frac{2}{3}=\frac{8}{15}+\frac{10}{15}=\frac{18}{15}\)