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=( 1/12+9/12+2/12+1/12) + ( 2/7+5/7) + (10/20+9/20)
= 13/12 +1+19/20
đến đây bạn tự tính nha
a) \(\frac{27}{36}=\frac{3}{4}\)
b) \(\frac{45}{60}=\frac{3}{4}\)
c) \(\frac{2}{4}=\frac{1}{2}\)
d) \(\frac{10}{12}=\frac{5}{6}\)
e) \(\frac{112}{252}=\frac{4}{9}\)
Đúng nha bạn !!@@
\(\frac{1}{3}+\frac{3}{4}x\frac{5}{9}=\frac{1}{3}+\frac{5}{12}=\frac{3}{4}\)
\(\frac{7}{12}-\frac{5}{4}x\frac{2}{15}=\frac{7}{12}-\frac{1}{6}=\frac{5}{12}\)
\(y+\frac{1}{4}=\frac{7}{8}-\frac{3}{8}=y+\frac{1}{4}=\frac{1}{2}=\frac{1}{2}-\frac{1}{4}=\frac{1}{4}\)
\(y-\frac{5}{12}=\frac{2}{3}-\frac{1}{4}=y-\frac{5}{12}=\frac{5}{12}=\frac{5}{12}+\frac{5}{12}=\frac{5}{6}\)
\(\frac{12}{7}xy=\frac{16}{21}=\frac{16}{21}:\frac{12}{7}=\frac{4}{9}\)
\(\frac{5}{4}:y=\frac{7}{12}=\frac{5}{4}:\frac{7}{12}=\frac{15}{7}\)
12/14 + 15/20 + 6/7 + 3/4
= ( 12/14 + 6/7 ) + ( 15/20 + 3/4 )
= ( 6/7 + 6/7 ) + ( 3/4 + 3/4 )
= 12/7 + 6/4
= 48/28 + 42/28
= 90/28
= 45/14
Tham khảo nha !!!
Quy đồng :
\(a,\frac{4}{5},\frac{7}{9}\)
\(b,\frac{5}{6},\frac{17}{18}\)
\(c,\frac{3}{8},\frac{7}{12}\)
A ) 4 / 5 = 4 x 9 / 5 x 9 = 36 / 45
7 / 9 = 7 x 5 / 9 x 5 = 35/ 45
B ) 5 / 6 = 5 x 18 / 6 x 18 = 90 / 108
17 / 18 = 17 x 6 / 18 x 6 = 102 / 108
C ) 3 / 8 = 3 x 12 / 8 x 12 = 36 / 96
7 / 12 = 7 x 8 / 12 x 8 = 56 / 96
\(7:\frac{1}{5}=7\cdot\frac{5}{1}=35\)
\(\frac{5}{12}-\frac{5}{15}=\frac{5\cdot15-5\cdot12}{12\cdot15}=\frac{1}{12}\)
\(\frac{7}{9}:\frac{5}{12}=\frac{7}{9}\cdot\frac{12}{5}=\frac{28}{15}\)
\(7:\frac{1}{5}=35\)
\(\frac{5}{12}-\frac{5}{15}=\frac{1}{12}\)
\(\frac{7}{9}:\frac{5}{12}=1\frac{13}{15}=\frac{28}{15}\)