5+5+5+5+6+5-6-9=
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5 + 5 + 5 + 6 + 65 + 6 + 6 + 6 + 6 + 6 + 6 + 6 + 6 + 6 + 6 + 9 + 49 + 9 + 9 + 5 + 5 + 5 + 3 + 5 = 478.
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1: =1/8*9/4=9/32
2: =8/27*243/32=9/4
3: =(5/4*4/5)^5*(4/5)^2=16/25
4: \(=\left(-\dfrac{5}{6}\cdot\dfrac{6}{5}\right)^2\cdot\left(\dfrac{6}{5}\right)^2=\dfrac{36}{25}\)
5: \(=\left(-\dfrac{4}{3}\right)^3\cdot\left(\dfrac{3}{4}\right)^{10}=\left(-1\right)\left(\dfrac{3}{4}\right)^7=-\left(\dfrac{3}{4}\right)^7\)
6: \(=\left(\dfrac{1}{3}\cdot\dfrac{-9}{2}\right)^4\left(-\dfrac{9}{2}\right)^2=\left(-\dfrac{3}{2}\right)^4\cdot\dfrac{81}{4}=\dfrac{9}{4}\cdot\dfrac{81}{4}=\dfrac{729}{16}\)
8: =(0,2*5)^4*5^2=25
10: =-0,5^5*2^10
=-0,5^5*2^5*2^5
=-32
13: =(0,5*2)^2*2^2=4
![](https://rs.olm.vn/images/avt/0.png?1311)
5 + 6 + 9 + 5 + 6 + 2 + 5 +5 + 5+ 5 + 5 + 5 + 5 + 2 + 8 + 9 =87
vậy số đó là 87
.
![](https://rs.olm.vn/images/avt/0.png?1311)
(4/9-3/5):6/5+(5/9+1/5):6/5
=-7/45:6/5+34/45:6/5
=-7/54+17/27
=1/2
(20/45-27/45):6/5+(25/45+9/45):6/5= -7/45:6/5+34/45:6/5= -7/45.5/6+34/45.5/6=5/6.(-7/45+34/45)=5/6.(27/45)=5/6.3/5=1/2
![](https://rs.olm.vn/images/avt/0.png?1311)
Lời giải chi tiết:
10 = 5 + 5 | 9 < 2 + 8 | 6 > 6 – 1 |
9 < 5 + 5 | 10 > 7 + 1 | 5 + 2 < 5 + 3 |
2 + 6 > 3 + 2 | 4 + 4 = 5 + 3 | 4 + 5 = 5 + 4 |
![](https://rs.olm.vn/images/avt/0.png?1311)
\(9+2+5+3+7+8+4+2+9+6+4+65+6+7+4+6+3+7+4+8+5+9+08+87+1+2+3+4+2+3+2+5+6+767+5+75+6+4+6+5+66+5+7+546+46+43+6+3+6+4+6+7+8878+68+68+6+7+9+9=10961\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) \(\dfrac{6}{7}=\dfrac{6\times11}{7\times11}=\dfrac{66}{77}\) ; \(\dfrac{5}{11}=\dfrac{5\times7}{11\times7}=\dfrac{35}{77}\)
b) \(\dfrac{5}{9}=\dfrac{5\times5}{9\times5}=\dfrac{25}{45}\) ; \(\dfrac{9}{5}=\dfrac{9\times9}{5\times9}=\dfrac{81}{45}\)
c) \(\dfrac{3}{8}=\dfrac{3\times3}{8\times3}=\dfrac{9}{24}\) ; \(\dfrac{5}{24}\) giữ nguyên phân số
d) \(\dfrac{6}{5}=\dfrac{6\times6}{5\times6}=\dfrac{36}{30}\) ; \(\dfrac{5}{6}=\dfrac{5\times5}{6\times5}=\dfrac{25}{30}\)
\(#Wendy.Dang\)
a) 6/7 và 5/11
ta có :
6/7=66/77
5/11=35/77
b)5/9 và 9/5
ta có
5/9=25/45
9/5=81/45
C)3/8 và 5/24
ta có :
3/8=9/24
5/24
D)6/5 và 5/6
ta có
6/5=36/30
5/6=25/30
![](https://rs.olm.vn/images/avt/0.png?1311)
Lời giải chi tiết:
6 + 3 = 9 | 3 + 4 < 5 + 3 | 4 + 5 = 5 + 4 |
9 – 2 > 6 | 9 – 0 = 8 + 1 | 9 – 6 > 8 – 6 |
5 + 5 + 5 + 5 + 6 + 5 - 6 - 9 = 16
5 + 5 + 5 + 5 + 6 + 5 - 6 - 9 = 16