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1.
a, Ta có 28=14⇒14+56=1312(Bn tự quy đồng lên nhé !)
b,Ta có1216=34⇒18+34=78(Bn tự quy đồng lên nhé !)
c,Ta có636=16⇒14+16=512(Bn tự quy đồng lên nhé !)
d,Ta có1218=23⇒23+14=1112(Bn tự quy đồng lên nhé !)
7.Phần này mk chỉ cho đáp án thuia.67 ;
b,420=15 ;
c,615 ;
d,129
12/18 + 12/42 = 2/3 + 2/7 = 14/21 + 6/21 = 20/21
1/2 + 2/4 + 3/6 + 4/8 + 5/10 + 6/12
= 1/2 + 1/2 + 1/2 + 1/2 + 1/2 + 1/2
= 1/2 x 6
=6/2
=3
2/8 + 5/6 = 13/12
1/8 + 12/16 = 7/8
1/4 + 6/30 = 1/2
12/18 + 12/42 = 60/63
A ) 2/8 + 5/6 = 12/48 + 40/48 = 52/48
B) 1/8 + 12/16 = 16/128 + 96/128
C) 1/4 + 6/30 = 30/120 + 24/120 = 54/120
D) 12/18 + 12/42 = 504/756 + 216/756 = 720/756
Sai thì thoi
A) 1/4 + 5/6=6/24+20/24=26/24
B) 2/9 + 1/9 = 3/9
C)1/6 + 3/8 = 8/48 + 18/48 = 26/48
(d) 3/10 + 5/8= 14/80 + 50/80= 64/160
(E) 7/12 + 1/8 = 56/96+12/96=68/192
(G) 3/20 + 7/2=6/24+20/24=26/24
K nha
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
A\(\frac{1}{2}+\frac{1}{2}=\frac{2}{4}=\frac{1}{2}\)
B\(\frac{3}{8}+\frac{1}{8}=\frac{4}{8}=\frac{1}{2}\)
C\(\frac{7}{9}+\frac{5}{9}=\frac{12}{9}=\frac{4}{3}\)
D\(\frac{1}{6}+\frac{2}{6}=\frac{3}{6}=\frac{1}{2}\)
E\(\frac{3}{8}+\frac{7}{8}=\frac{10}{8}=\frac{5}{4}\)
G\(\frac{2}{5}+\frac{3}{5}=\frac{5}{5}=1\)
*cho mik sửa câu a:
\(\frac{1}{2}+\frac{1}{2}=\frac{2}{2}=1\)
b: 12/20+6/18=3/5+1/3=9/15+5/15=14/15
c: 8/12+20/30=2/3+2/3=4/3
d: 10/12+12/36=5/6+2/6=7/6
a) \(\dfrac{5}{6}-\dfrac{2}{14}\)
\(=\dfrac{5}{6}-\dfrac{1}{7}\)
\(=\dfrac{35}{42}-\dfrac{6}{42}\)
\(=\dfrac{29}{42}\)
b) \(\dfrac{5}{20}-\dfrac{1}{6}\)
\(=\dfrac{1}{4}-\dfrac{1}{6}\)
\(=\dfrac{3}{12}-\dfrac{2}{12}\)
\(=\dfrac{1}{12}\)
c) \(\dfrac{5}{9}-\dfrac{3}{12}\)
\(=\dfrac{5}{9}-\dfrac{1}{4}\)
\(=\dfrac{20}{36}-\dfrac{9}{36}\)
\(=\dfrac{11}{36}\)
d) \(8-\dfrac{4}{6}\)
\(=\dfrac{48}{6}-\dfrac{4}{6}\)
\(=\dfrac{44}{6}=\dfrac{22}{3}\).
a, 2/8 + 5/6 = 1/4 +5/6 = 6/24 + 20/24 = 26/24
b,1/8 + 12/16 = 1/8 + 3/4 = 4/32 + 24/32 = 28/32
c, 1/4 + 6/30 = 1/4 + 1/5 = 5/20 + 4/20 = 9/29
d, 12/18 + 12/42 = 2/3 + 2/7 = 14/21 + 6/21 = 20/21
nhé
Bài 6 : rút gọn rồi tính
A ) 2/8 + 5/6 = 3/12 + 10/12 = 13/12.
B ) 1/8 + 12/16 = 1/8 + 6/8 = 7/8.
C ) 1/4 + 6/30 = 5/20+ 4/20 = 9/20.
D ) 12/18 + 12/42 = 14/21 + 6/21 = 20/21.