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a) \(\frac{1}{2}+\frac{1}{4}< \frac{3}{4}+\frac{1}{5}\)
b) \(\frac{7}{13}+\frac{2}{9}>\frac{3}{26}+\frac{7}{13}\)
~ GHÉT ..............................~
a) \(\frac{1}{2}+\frac{1}{4}< \frac{3}{4}+\frac{1}{5}\)
b) \(\frac{7}{13}+\frac{2}{9}>\frac{3}{26}+\frac{7}{13}\)
ta có 1/5+1/5+1/5+1/5+1/5>1/5+1/6+1/7+1/8+1/9. Ma : 1/5+1/5+1/5+1/5+1/5=1 Nen :1/5+1/6+1/7+1/8+1/9<1
\(\frac{9}{8}>\frac{8}{9}\)
\(\frac{16}{23}>\frac{16}{25}\)
\(\frac{8}{11}< \frac{8}{10}\)
\(\frac{10}{13}>\frac{19}{26}\)
\(\frac{13}{15}< \frac{11}{10}\)
\(\frac{11}{9}=\frac{44}{36}\)
9/8 > 8/9
16/23 > 16/25
8/11 < 8/10
10/13 > 19/26
13/15 < 11/10
11/9 = 44/36
Tham khảo nha !
Chúc bạn học giỏi !
\(\frac{7}{10}< \frac{15}{x}< \frac{7}{9}\)
\(\Rightarrow\frac{105}{150}< \frac{15}{7x}< \frac{105}{135}\)
\(\Rightarrow135< 7x< 150\)
\(\Rightarrow19< x< 21\)
\(\Rightarrow x=20\)
\(\frac{7}{10}< \frac{15}{ }< \frac{7}{9}\)
\(\Leftrightarrow\frac{7}{10}< \frac{15}{13}< \frac{7}{9}\)
Vậy chỗ cần tìm là 13 @@
\(\left(2.8x-32\right):\frac{2}{3}=90\)
\(2.8\cdot x-32=90\cdot\frac{2}{3}\)
\(\frac{14}{5}x-32=60\)
\(\frac{14}{5}x=60+32\)
\(\frac{14}{5}x=92\)
\(x=\frac{230}{7}\)
B , c , d tương tự
6/7>7/9
31/32<26/25
2014/4>1
\(\frac{6}{7}\) > \(\frac{7}{9}\)
\(\frac{31}{32}\) < \(\frac{26}{25}\)
\(\frac{2014}{4}\) > 1