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A) 12/16
2*3; 6/21
42:6; 4/7
B) 6/9
6/8
8/28=10/35
12/20
4/3
6/9=2/3=16/28
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\(\dfrac{1}{2}+\dfrac{5}{6}+\dfrac{11}{12}+\dfrac{19}{20}+\dfrac{29}{30}+\dfrac{41}{42}+\dfrac{55}{56}+\dfrac{71}{72}+\dfrac{89}{90}=1-\dfrac{1}{2}+1-\dfrac{1}{6}+1-\dfrac{1}{12}+....+1-\dfrac{1}{90}=1+1+...+1-\left(\dfrac{1}{2}+\dfrac{1}{6}+...+\dfrac{1}{90}\right)=9-\left(\dfrac{1}{1x2}+\dfrac{1}{2x3}+...+\dfrac{1}{9x10}\right)=9-\left(\dfrac{1}{1}-\dfrac{1}{2}+\dfrac{1}{2}-\dfrac{1}{3}+....+\dfrac{1}{9}-\dfrac{1}{10}\right)=9-\left(1-\dfrac{1}{10}\right)=9-\dfrac{9}{10}=\dfrac{81}{10}\)
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Bài 1: Tính giá trị các biểu thức sau:
14 x 3 + 23 x 4
23 x 5 – 96 : 4
16 x 3 + 55 : 5
968 : 8 – 13 x 7
69 : 3 + 21 x 4
36 x 3 – 29 x 2
72 : ( 107 – 99)
5 x (145 – 123)
đề lại bị lỗi
Bài 1: Tính giá trị các biểu thức sau:
14 x 3 + 23 x 4 23 x 5 – 96 : 4 16 x 3 + 55 : 5 968 : 8 – 13 x 769 : 3 + 21 x 4 36 x 3 – 29 x 2 72 : ( 107 – 99) 5 x (145 – 123)
=> Thiếu phép tính
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\(\frac{2}{3}+2+\frac{4}{18}=\frac{2}{3}+2+\frac{2}{9}=\frac{6}{9}+\frac{18}{9}+\frac{2}{9}=\frac{6+18+2}{9}=\frac{26}{9}\)\(\frac{26}{9}\)
\(\frac{4}{3}-\frac{2}{5}+\frac{1}{2}=\frac{40}{30}-\frac{12}{30}+\frac{15}{30}=\frac{40-12+15}{30}=\frac{43}{30}\)
\(\frac{1}{72}+\frac{1}{56}+\frac{1}{42}+\frac{1}{30}+\frac{1}{20}+\frac{1}{12}=\)\(\frac{1}{8}-\frac{1}{9}+\frac{1}{7}-\frac{1}{8}+\frac{1}{6}-\frac{1}{7}+\frac{1}{5}-\frac{1}{6}+\frac{1}{4}-\frac{1}{5}+\frac{1}{3}-\frac{1}{4}=\)\(\frac{1}{3}-\frac{1}{9}=\frac{3}{9}-\frac{1}{9}=\frac{3-1}{9}=\frac{2}{9}\)
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a) 72/45 x 35/36= 8/5 x 35/36 =280/180=14/9.
b)1/2:3/4+1/6:3/4 =(1/2+1/6) : 3/4 =8/12:3/4 = 24/36=2/3
c) 2/3x4/5+1/3=2/3+1/3x4/5+1/3=4/3x4/15=16/45.
Nếu sai thông cảm cho mình nhé. Bạn ko k cũng ko sao đâu.
1) 2310 : 35 = 66
2) 598 : 23 = 26
3) 1596 : 42 = 38
4) 1044 : 29 = 36
5) 4968 : 72 = 69
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