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1+3+3.3+3.3.3+3.3.3.3+3.3.3.3.3
=1+3+32+33+34+35
=(1+3+32) + ( 33+34+35 )
= 13 + 33 + (1+32+33)
=13 + 33 + 13
=13.(1+33) chia hết cho 13
![](https://rs.olm.vn/images/avt/0.png?1311)
Ta có: \(A=\dfrac{1-0.5\cdot\left(3.84-2.4\right):0.8}{\dfrac{4}{5}-\left(1\dfrac{1}{3}-2\dfrac{1}{6}\right)-1.5}\)
\(=\dfrac{1-0.5\cdot1.44:0.8}{\dfrac{4}{5}-\left(\dfrac{4}{3}-\dfrac{13}{6}\right)-\dfrac{3}{2}}\)
\(=\dfrac{1-0.9}{\dfrac{4}{5}+\dfrac{5}{6}-\dfrac{3}{2}}=\dfrac{0.1}{\dfrac{2}{15}}=\dfrac{3}{4}\)
Giải:
A=1-0,5.(3,84-2,4):0,8 / 4/5-(1 1/3 - 2 1/6)-1,5
A=1-0,5.1,44:0.8 / 4/5-(4/3-13/6)-3/2
A=1-0.9 / 4/5-(-5/6)-3/2
A=0.1 / 2/15
A= 1/10 : 2/15
A=3/4
Chúc bạn học tốt!
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(3.x - 6) . 3 = 3.33
(3.x - 6) . 3 = 3. 27
(3.x - 6) . 3 = 81
3.x - 6 = 81 : 3
3.x - 6 = 27
3.x = 27 + 6
3.x = 33
x = 33 : 3
x = 11
3.33 = 3.27 = 81
3.x - 6 = 81 : 3
3.x - 6 = 27
3.x = 27 + 6
3.x = 33
x = 33 : 3
x = 11
![](https://rs.olm.vn/images/avt/0.png?1311)
\(a,9234:\left[3\cdot3\cdot\left(1+8^3\right)\right]\\ =9234:\left[9\cdot\left(1+512\right)\right]\\ =9234:\left(9\cdot513\right)\\ =9234:4617\\ =2\\ b,76-\left\{2\cdot\left[2\cdot5^2-\left(31-2\cdot3\right)\right]\right\}+3\cdot25\\ =76-\left\{2\cdot\left[2\cdot25-\left(31-6\right)\right]\right\}+75\\ =76-\left[2\cdot\left(50-25\right)\right]+75\\ =76-\left(2\cdot25\right)+75\\ =76-50+75\\ =26+75\\ =-49\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\left(3x-6\right).3=3.3^3\)
\(\Leftrightarrow9x-18=3.27\)
\(\Leftrightarrow9x-18=81\)
\(\Leftrightarrow9x=99\)
\(\Leftrightarrow x=11\)
![](https://rs.olm.vn/images/avt/0.png?1311)
nó là bang 20
kết quả này
3*20=60 nghe bạn