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1.Tính
a) 5/6+1/2=4/3
b)7/8+1/4=9/8
c)5/9+3/7=62/63
2.5/6=1/2+1/3
k cho mik nha !
\(a.\frac{1}{5}+\frac{7}{3}+6+5\)
\(=\frac{30}{150}+\frac{350}{150}+\frac{25}{150}+\frac{30}{150}\)
\(=\frac{30+350+25+30}{150}\)
\(=\frac{435}{150}\)
\(b.\frac{9}{10}+\frac{7}{2}+\frac{1}{5}\)
\(=\frac{9}{10}+\frac{35}{10}+\frac{2}{10}\)
\(=\frac{9+35+2}{10}\)
\(=\frac{46}{10}\)
\(c.\frac{9}{2}-\frac{1}{5}\)
\(=\frac{45}{10}-\frac{2}{10}\)
\(=\frac{45-2}{10}\)
\(=\frac{43}{10}\)
\(d.\frac{7}{3}-\frac{5}{21}\)
\(=\frac{49}{21}-\frac{5}{21}\)
\(=\frac{49-5}{21}\)
\(=\frac{44}{21}\)
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
Trình bày hết ra thì dài lắm. Mình nói cái chính rồi bạn làm nốt.
Cách 1 ở tất cả các câu: Tính bình thường như đề cho
a) Cách 2: \(\frac{5}{7}\times\frac{3}{4}+\frac{5}{7}\times\frac{1}{2}\)
b) Cách 2: \(\frac{13}{21}\times\left(\frac{5}{7}+\frac{2}{7}\right)\)
c) Cách 2: \(\frac{2}{5}\times\frac{1}{2}+\frac{2}{5}\times\frac{1}{3}\)
d) Cách 2: \(\frac{17}{21}\times\left(5+\frac{2}{5}\right)\)
\(\frac{2}{3}+\frac{5}{9}-\frac{3}{4}\)
\(=\frac{24}{36}+\frac{20}{36}-\frac{27}{36}\)
\(=\frac{17}{36}\)
\(\frac{2}{7}:\frac{2}{3}-\frac{1}{7}\)
\(=\frac{3}{7}-\frac{1}{7}\)
\(=\frac{2}{7}\)
\(\frac{2}{5}\times\frac{1}{4}:\frac{3}{8}\)
\(=\frac{1}{10}:\frac{3}{8}\)
\(=\frac{8}{30}\)
\(=\frac{4}{15}\)
\(\frac{2}{7}+\frac{5}{7}=\frac{7}{7}=1\)
\(\frac{8}{15}+\frac{6}{15}=\frac{14}{15}\)
\(\frac{2}{3}+\frac{3}{9}+\frac{4}{9}=\frac{6}{9}+\frac{3}{9}+\frac{4}{9}=\frac{9}{9}+\frac{4}{9}=\frac{13}{9}\)
a] 4/12 ; 5/12 ; 11/2 ; 1/4
b] 1 ; 9/12; 12/5 ; 11/3
c] 8/21; 6/11;8/7
d] 2/3 ;2/7 15/2
a]1/3 5/12 11/2 1/4
b]1 3/4 12/5 33/9
c]8/21 6/11 8/7
d]2/3 2/7 15/2
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:
\(\frac{1}{2}+\frac{1}{2}=\frac{2}{2}=1\)
a, 5/6 + 1/2 = 4/3
b, 7/8 + 1/4 = 9/8
c, 5/9 + 3/7 = 62/63
a,5/6+1/4=8/6 rút gọn =4/3 b,7/8+1/4=9/8 c,5/9+3/7=53/63