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Bài 1:
a)\(\frac{12}{33}\)\(< \)\(\frac{16}{33}\)(So sánh tử)
b) \(\frac{2}{5}\)=\(\frac{4}{10}\)\(>\)\(\frac{3}{10}\)(Quy đồng mẫu, so sánh tử)
Bài 2:
a)\(\frac{17}{24}+\frac{7}{24}=\frac{24}{24}=1\)
b) \(\frac{3}{5}+\frac{5}{3}=\frac{9}{15}+\frac{25}{15}=\frac{34}{15}\)
Bài 3:
a)\(\frac{7}{4}-\frac{3}{4}=\frac{4}{4}=1\)
b)\(\frac{21}{24}-\frac{6}{8}=\frac{21}{24}-\frac{18}{24}=\frac{3}{24}=\frac{1}{8}\)
a) \(\dfrac{2}{5}+\dfrac{2}{3}+\dfrac{3}{4}=\dfrac{24}{60}+\dfrac{40}{60}+\dfrac{45}{60}=\dfrac{24+40+45}{60}=\dfrac{109}{60}\)
b) \(\dfrac{1}{3}+\dfrac{5}{12}+\dfrac{5}{6}=\dfrac{4}{12}+\dfrac{5}{12}+\dfrac{10}{12}=\dfrac{4+5+10}{12}=\dfrac{19}{12}\)
c) \(\dfrac{1}{6}+\dfrac{5}{24}+\dfrac{2}{3}=\dfrac{4}{24}+\dfrac{5}{24}+\dfrac{16}{24}=\dfrac{4+5+16}{24}=\dfrac{25}{24}\)
\(\frac{7}{9}+\frac{6}{7}\times\frac{4}{5}=\frac{7}{9}+\frac{24}{35}=\frac{361}{315}\)
\(\frac{21}{23}+\frac{4}{5}:\frac{6}{8}=\frac{21}{23}+\frac{16}{15}=\frac{548}{345}\)
\(\frac{5}{8}\times\frac{4}{9}:\frac{2}{3}=\frac{5}{18}:\frac{2}{3}=\frac{5}{12}\)
\(\frac{7}{12}+\frac{5}{6}-\frac{21}{24}=\frac{14}{24}+\frac{20}{24}-\frac{21}{24}=\frac{11}{24}\)
b,
\(\frac{21}{23}+\frac{4}{5}:\frac{6}{8}=\frac{21}{23}+\frac{4}{5}.\frac{8}{6}=\frac{21}{23}+\frac{16}{15}=1\frac{338}{345}\)
c,
\(\frac{5}{8}.\frac{4}{9}.\frac{3}{2}=\frac{5}{12}\)
d,
\(\frac{7}{12}+\frac{5}{6}-\frac{21}{24}=\frac{14}{24}+\frac{20}{24}-\frac{21}{24}=\frac{13}{24}\)
chán thật
A) 1/2 + 1/4 = 4/8 + 2/8= 6/8
B) 2/3 + 1/6 = 12/18 + 3/18 = 15/18
C) 7/12 + 1/2 = 14/24 + 12/24 = 26/24
D) 1/8 + 3/4 = 4/32 + 24/32 = 28/32
E) 2/3 + 1/12 = 24/36 + 3/36 = 27/36
G) 5/8 + 5/24 = 120/192 + 40/192 = 160 / 192
K a nha
Bài 1:
\(\frac{1}{12},\frac{2}{3},\frac{3}{4},\frac{5}{6}\)
Bài 2:
A. \(\frac{11}{6}\)
B. \(\frac{3}{32}\)
C. \(\frac{1}{7}\)
D. \(\frac{15}{8}\)
Tích đúng cho mình nhé!
A) \(\frac{7}{8}-\frac{5}{12}=\frac{84}{96}-\frac{40}{96}=\frac{44}{96}=\frac{11}{24}\)
B)\(\frac{8}{15}-\frac{2}{5}=\frac{8}{15}-\frac{6}{15}=\frac{2}{15}\)
C)\(\frac{5}{6}-\frac{3}{10}=\frac{50}{60}-\frac{18}{60}=\frac{32}{60}=\frac{8}{15}\)
D)\(\frac{7}{10}-\frac{1}{5}=\frac{7}{10}-\frac{2}{10}=\frac{5}{10}=\frac{1}{2}\)
2)A)\(\frac{5}{10}-\frac{2}{15}=\frac{1}{2}-\frac{2}{15}=\frac{15}{30}-\frac{4}{30}=\frac{11}{30}\)
B)\(\frac{5}{20}-\frac{1}{6}=\frac{1}{4}-\frac{1}{6}=\frac{6}{24}-\frac{4}{24}=\frac{2}{24}=\frac{1}{12}\)
C)\(\frac{6}{18}-\frac{6}{24}=\frac{1}{3}-\frac{1}{4}=\frac{4}{12}-\frac{3}{12}=\frac{1}{12}\)
D)\(\frac{5}{9}-\frac{3}{12}=\frac{5}{9}-\frac{1}{4}=\frac{20}{36}-\frac{9}{36}=\frac{11}{36}\)
Chúc bạn học tốt
b, 3/5 + 4/7 + 2/8 + 10/25 + 9/21 + 28/16
= 3/5 + 4/7 + 2/8 + 2/5 + 3/7 + 14/8
= (3/5 + 2/5) + ( 4/7 + 3/7) + ( 2/8 + 14/8)
= 1 + 1 + 7/4
= 2 + 7/4 = 15/4
c , 8/7 + 7/6 + 5/8 + 10/12 + 24/28 + 6/16
= c , 8/7 + 7/6 + 5/8 + 5/6 + 6/7 + 1/2
= (8/7 + 6/7) + (7/6 + 5/6) + 5/8 + 1/2
= 14/7 + 12/6 + 5/8 + 1/2
= 2 + 2 + 5/8 + 1/2
= 4 + 9/8 = 41/8
a) 18/24= 3/4
b) 5/5 = 1
c) 21/27 = 7/9
d) 16/12 = 4/3
Bài 3: 25cm x 32cm = 800cm2 = 8dm2
Bài 1.
a) \(\frac{11}{24}+\frac{7}{24}=\frac{18}{24}=\frac{3}{4}\)
b) \(\frac{2}{3}+\frac{3}{5}=\frac{10}{15}+\frac{9}{15}=\frac{19}{15}\)
c) \(\frac{6}{27}+\frac{5}{9}=\frac{2}{9}+\frac{5}{9}=\frac{7}{9}\)
d) \(\frac{7}{12}+\frac{3}{4}=\frac{7}{12}+\frac{9}{12}=\frac{16}{12}=\frac{4}{3}\)
Bài 2.
Đổi 3dm 2cm = 32cm
Diện tích hình bình hành là:
\(25\times32=800\left(cm^2\right)\)
Đáp số: \(800cm^2\)
@muối
TL
a) 2/5 +2/3 + 3/4=109/60
1/3+5/12+5/6=19/12
1/6+5/24+2/3=25/24
nha bn
HT
a) 2/5 + 2/3 + 3/4 = 109/60
b) 1/3 + 5/12 + 5/6 = 19/12
c) 1/6 + 5/24 + 2/3 = 25/24