Bài 1:
\(\left(\frac{9}{4}:\frac{6}{5}\right)-1=\frac{45}{24}-1=\frac{15}{8}-1=\frac{7}{8}\)
\(2+\left(\frac{1}{4}\times\frac{2}{5}\right)=2+\frac{2}{10}=2+\frac{1}{5}=\frac{11}{5}\)
Bài 2:
\(\frac{3}{5}+\frac{2}{3}=\frac{9}{15}+\frac{10}{15}=\frac{19}{15}\)
\(1-\frac{9}{11}=\frac{1}{1}-\frac{9}{11}=\frac{11}{11}-\frac{9}{11}=\frac{2}{11}\)
\(\frac{7}{9}\times\frac{3}{14}=\frac{21}{126}=\frac{3}{18}\)
\(\frac{15}{7}:\frac{5}{21}=\frac{315}{35}=9\)
1 Tính giá trị biểu thức
( 9/4 : 6/5 ) - 1 = 45/24 - 1 = 7/8
2 + ( 1/4 × 2/5 ) = 2 + 1/10 = 21/10
2 Tính
3/5 + 2/3 =
1 - 9/11 = 2/11
7/9 × 3/14 = 1/6
15/7 : 5/21 = 9
(9/4 : 6/5) - 1 = (9/4 . 5/6) - 1
= 15/8 - 1 = 7/8
2 + (1/4 x 2/5) = 2 + 1/10
= 21/10
3/5 + 2/3 = 19/15
1 - 9/11 = 2/11
7/9 x 3/14 = 1/6
15/7 : 5/21 = 9
