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a) \(\dfrac{16}{24};\dfrac{14}{15};\dfrac{25}{27};\dfrac{50}{100}\)
b) \(\dfrac{9}{4};\dfrac{5}{4};\dfrac{7}{5};\dfrac{19}{7};\dfrac{49}{36}\)
c) \(\dfrac{13}{13};\dfrac{35}{35}\)
a: 16/24; 14/15; 25/27; 50/100
b: 9/4; 5/4; 7/5; 19/7; 49/36
c: 13/13; 35/35
bài 1:
các ps ....lớn đến bé là:
b1:8/10;14/20;27/40;5/8.
b2: (rút gọn)
5/8 ; 4/5 ; 7/10 ; 27/40.
\(\frac{4}{6}=\frac{2}{3}\)
\(\frac{18}{27}=\frac{2}{3}\)
\(\Rightarrow\frac{4}{6}=\frac{18}{27}\)
\(\frac{12}{20}=\frac{3}{5}\)
\(\frac{22}{55}=\frac{2}{5}\)
\(\Rightarrow\frac{12}{20}>\frac{22}{55}\)
\(\frac{5}{6}=\frac{10}{12}\)
\(\Rightarrow\frac{5}{6}< \frac{11}{12}\)
Sắp xếp :
4;5;7;8;15;56
HT
\(\frac{4}{6}=\frac{2}{3}\)
\(\frac{18}{27}=\frac{2}{3}\)
\(\Rightarrow\frac{4}{6}=\frac{18}{27}\)
\(\frac{12}{20}=\frac{3}{5}\)
\(\frac{22}{55}=\frac{2}{5}\)
\(\Rightarrow\frac{12}{20}>\frac{22}{55}\)
\(\frac{5}{6}=\frac{10}{12}\)
\(\Rightarrow\frac{5}{6}< \frac{11}{12}\)
Sắp xếp:
4; 5; 7; 8; 15; 56.
_HT_
Bài 1:
a) 19/27+9/7+6/27+5/7+2/7
= (19/27+6/27) + (9/7+5/7+2/7)
=1 + 16/7
=23/7
b) 2/7 + 27/48 + 7/16 +45/63
= (2/7 + 45/63) + (27/48 +7/16)
= (2/7 + 5/7) + ( 9/16 + 7/16)
= 1 + 1
=2
c) Tính bằng cách bình thường
Bài 2:
6/11 + x = 1
x = 1-6/11
x = 5/11
Bài làm
a) \(\frac{19}{27}+\frac{9}{7}+\frac{6}{27}+\frac{5}{7}+\frac{2}{7}\)
\(=\frac{27}{27}+\frac{16}{7}\)
\(=1+\frac{16}{7}\)
\(=\frac{7}{7}+\frac{16}{7}\)
\(=\frac{23}{7}\)
b) \(\frac{2}{7}+\frac{27}{48}+\frac{7}{16}+\frac{45}{63}\)
\(=\left(\frac{18}{63}+\frac{45}{63}\right)+\left(\frac{27}{48}+\frac{21}{48}\right)\)
\(=\frac{63}{63}+\frac{48}{48}\)
\(=1+1\)
\(=2\)
c) \(\frac{17}{23}+\left(\frac{4}{7}-\frac{6}{13}\right)\)
\(=\frac{17}{23}+\left(\frac{52}{91}-\frac{42}{91}\right)\)
\(=\frac{17}{23}+\frac{10}{91}\)
\(=\frac{1547}{2093}+\frac{230}{2093}\)
\(=\frac{1770}{2093}\)
Bài 2
\(\frac{6}{11}+x=1\)
\(x=1-\frac{6}{11}\)
\(x=\frac{11}{11}-\frac{6}{11}=\frac{5}{11}\)
Vậy \(x=\frac{5}{11}\)
C
C