Đặt tính rồi tính.
a) 9 251 + 24 078
b) 17 262 – 5 637
c) 8 316 x 4
d) 2 745 : 9
Đặt tính rồi tính.
a) 423 x 2 107 x 9 91 x 8
b) 848 : 4 740 : 5 569 : 9
Tính.
a) \(\dfrac{5}{7}\times\dfrac{7}{15}\) b) \(\dfrac{8}{21}\times3\) c) \(\dfrac{24}{17}:\dfrac{9}{17}\) d) \(\dfrac{36}{5}:9\)
\(a)\dfrac{5}{7}\times\dfrac{7}{15}\\ =\dfrac{5\times7}{7\times15}\\ =\dfrac{35}{105}=\dfrac{1}{3}\\ b)\dfrac{8}{21}\times3\\ =\dfrac{8\times3}{21}\\ =\dfrac{24}{21}=\dfrac{8}{7}\\ c)\dfrac{24}{17}:\dfrac{9}{17}\\ =\dfrac{24}{17}\times\dfrac{17}{9}\\ =\dfrac{24\times17}{17\times9}\\ =\dfrac{408}{153}=\dfrac{8}{3}\\ d)\dfrac{36}{5}:9\\ =\dfrac{36}{5}\times\dfrac{1}{9}\\ =\dfrac{36\times1}{5\times9}\\ =\dfrac{36}{45}=\dfrac{4}{5}\)
a) \(\dfrac{5}{7}\times\dfrac{7}{15}=\dfrac{5\times7}{7\times15}=\dfrac{35}{105}=\dfrac{1}{3}\)
b) \(\dfrac{8}{21}\times3=\dfrac{8\times3}{21}=\dfrac{24}{21}=\dfrac{8}{7}\)
c) \(\dfrac{24}{17}:\dfrac{9}{17}=\dfrac{24}{17}\times\dfrac{17}{9}=\dfrac{24\times17}{17\times9}=\dfrac{24}{9}=\dfrac{8}{3}\)
d) \(\dfrac{36}{5}:9=\dfrac{36}{5}\times\dfrac{1}{9}=\dfrac{36}{5\times9}=\dfrac{36}{45}=\dfrac{4}{5}\)
Đặt tính rồi tính :
a. 4,234 + 128,78
b. 9820, 5 – 723, 078
c. 12, 5 x 3
d. 19,72 : 5 ,8
Đặt tính rồi tính.
a) 15 480 + 66 059
b) 52 133 – 8 091
c) 8 205 x 6
d) 29 376 : 9
Đặt tính rồi tính :
\(a.\dfrac{5}{6}+\dfrac{2}{5}\)
\(b.\dfrac{6}{5}-\dfrac{3}{4}\)
\(c.\dfrac{9}{16}\times\dfrac{4}{3}\)
\(d.\dfrac{8}{17}:6\)
a: =25/30+12/30=37/30
b: =24/20-15/20=9/20
c: =36/48=3/4
d: =8/17x1/6=8/102=4/51
a) \(\dfrac{25}{30}+\dfrac{12}{30}=\dfrac{37}{30}\)
b) \(\dfrac{24}{20}-\dfrac{15}{20}=\dfrac{9}{20}\)
c) \(\dfrac{36}{48}=\dfrac{3}{4}\)
d) \(\dfrac{8}{17}\times\dfrac{1}{6}=\dfrac{8}{102}=\dfrac{4}{51}\)
\(\dfrac{5}{6}+\dfrac{2}{5}=\dfrac{25}{30}+\dfrac{12}{30}=\dfrac{37}{30}\)
\(\dfrac{6}{5}-\dfrac{3}{4}=\dfrac{24}{20}-\dfrac{15}{20}=\dfrac{9}{20}\)
\(\dfrac{9}{16}\times\dfrac{4}{3}=\dfrac{36}{48}\)
\(\dfrac{8}{17}:6=\dfrac{8}{102}\)
Đặt tính rồi tính?
5 071 x 9 17 218 x 4 58 472 :8 91 503 : 7
Rút gọn rồi tính.
a) \(\dfrac{2}{4}\times\dfrac{9}{5}\) b) \(\dfrac{13}{8}\times\dfrac{5}{15}\) c) \(\dfrac{3}{9}\times\dfrac{6}{12}\)
a) \(\dfrac{2}{4}\times\dfrac{9}{5}=\dfrac{1}{2}\times\dfrac{9}{5}=\dfrac{1\times9}{2\times5}=\dfrac{9}{10}\)
b) \(\dfrac{13}{8}\times\dfrac{5}{15}=\dfrac{13}{8}\times\dfrac{1}{3}=\dfrac{13}{24}\)
c) \(\dfrac{3}{9}\times\dfrac{6}{12}=\dfrac{1}{3}\times\dfrac{1}{2}=\dfrac{1}{3\times2}=\dfrac{1}{6}\)
a: =18/20=9/10
b: \(=\dfrac{13\cdot5}{8\cdot15}=\dfrac{13}{8}\cdot\dfrac{1}{3}=\dfrac{13}{24}\)
c: \(=\dfrac{1}{3}\cdot\dfrac{1}{2}=\dfrac{1}{6}\)
Tính giá trị của biểu thức.
a) 8 103 × 5 – 4 135 b) 24 360 : 8+ 9 600
c) 839 + 6 215 x 4 d) 17 286 - 45 234 : 9
a)
8 103 × 5 – 4 135
= 40 515 – 4 135
= 36 380
b)
24 360 : 8+ 9 600
= 3045 + 9 600
= 12 645
c)
839 + 6 215 × 4
= 839 + 24 860
= 25 699
d)
17 286 – 45 234 : 9
= 17 286 – 5 026
= 12 260