a) \(\dfrac{4}{5}+\dfrac{17}{25}=\dfrac{20}{25}+\dfrac{17}{25}=\dfrac{37}{25}\)
b) \(\dfrac{7}{3}-\dfrac{5}{6}=\dfrac{14}{6}-\dfrac{5}{6}=\dfrac{9}{6}=\dfrac{3}{2}\)
c)\(1+\dfrac{2}{3}=\dfrac{3}{3}+\dfrac{2}{3}=\dfrac{5}{3}\)
Tính:
a)
b) ;
c) ;
d) .
Tính:
a, 5/9 + 2/3 =
b, 7/8 x 5/7 =
c, 6/5 : 2/3 =
d, 7/2 - 29/14 =
2.Rút gọn rồi tính:
A) 3/5 : 3/2.
B) 3/7 : 3/14.
C) 5/7 x 7/10.
D) 5/11 x 33/15.
Bài1 tính:
a)\(\dfrac{2}{5}\)+\(\dfrac{5}{12}\); b)\(\dfrac{2}{3}\) - \(\dfrac{3}{8}\); c)\(\dfrac{3}{7}\) ✖ \(\dfrac{4}{9}\); d) \(\dfrac{11}{10}\) - \(\dfrac{2}{5}\) ː \(\dfrac{2}{3}\)
4. Đặt tính rồi tính:
a) 453 x 205 b) 25620 : 34
c) 452 x 760 d) 39488 : 162
Tính:
a) \(\dfrac{11}{10}+\dfrac{3}{5}:\dfrac{2}{3}\)
b) \(\dfrac{4}{3}\) + 5 x \(\dfrac{5}{8}\)
c) \(\left(\dfrac{2}{5}+\dfrac{3}{7}\right)x\dfrac{25}{29}\)
d) \(\dfrac{1}{4}x\dfrac{5}{12}+\dfrac{5}{12}x\dfrac{4}{5}\)
Đặt tính rồi tính:
a) 523 × 305
b) 308 × 563
c) 1 309 × 203
d) 235 × 503
e) 307×653
Tính:
a)
b)
2. Tính:
A) 3/7 x 7/9 x 1/2.
B) 5/8 x 4 x 1/2.
C) 4 x 1/24 x 3.
