Bài 1:
a) \(x.\dfrac{3}{4}=\dfrac{9}{14}\)
\(\Rightarrow x=\dfrac{9}{14}:\dfrac{3}{4}\)
\(\Rightarrow x=\dfrac{6}{7}\)
b) \(x:\dfrac{5}{9}=\dfrac{3}{10}\)
\(\Rightarrow x=\dfrac{3}{10}.\dfrac{5}{9}\)
\(\Rightarrow x=\dfrac{1}{6}\)
Đúng 5
Bình luận (0)
Bài 2:
a) \(\dfrac{3}{10}+\dfrac{2}{5}:\dfrac{4}{15}=\dfrac{3}{10}+\dfrac{3}{2}=\dfrac{9}{5}\)
b) \(\dfrac{4}{7}.3+\dfrac{2}{3}.2=\dfrac{12}{7}+\dfrac{4}{3}=\dfrac{64}{21}\)
Đúng 3
Bình luận (0)
Bài 1
a) x × 3/4 = 9/14
x = 9/14 : 3/4
x = 6/7
b) x : 5/9 = 3/10
x = 3/10 × 5/9
x = 1/6
Bài 2
a) 3/10 + 2/5 : 4/15
= 3/10 + 3/2
= 3/10 + 15/10
= 9/5
b) 4/7 × 3 + 2/3 × 2
= 12/7 + 4/3
= 64/21
Đúng 2
Bình luận (0)
