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![](https://rs.olm.vn/images/avt/0.png?1311)
a,63:62+94=6+94=100
b,135-54:52=135-52=135-25=110
c,73:7-45:43=72-42=49-16=33
d,87:84:82+8=8+8=16.
\(a,6^3:6^2+94=6+94=100\\ b,135-5^4:5^2=135-5^2=135-25=110\\ c,7^3:7-4^5:4^3=7^2-4^2=49-16=33\\ d,8^7:8^4:8^2+8=8^2+8=64+8=72\)
![](https://rs.olm.vn/images/avt/0.png?1311)
c) 73 : 7 - 45 : 43
= 72 - 42
= 49 - 16
= 33
d) 87 : 84 : 82 + 8
= 8 + 8
= 16
a) 63 : 62 + 94
= 6 + 94
= 100
b) 135 - 54 : 52
= 135 - 52
= 135 - 25
= 110
![](https://rs.olm.vn/images/avt/0.png?1311)
\(a,6^3:6^2+94=6+94=100\\ b,135-5^4:5^2=135-5^2=110\\ c,7^3:7-4^5:4^3=7^2-4^2=33\\ d,8^7:8^4:8^2+8=8+8=16\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a, 21.52.17 = 2.25.17 = 50.17 = 850
b, 22 + 23 + 24 = 4 + 8 + 16 = 28
c, 25.3 + 24:8 + 50: 52
= 32.3 + 16:8 + 50:25
=96 + 2 + 2
= 100
d, 112 - 102 - 32
= 121 - 100 - 9
= 21 - 9
= 12
e, 13 + 23 + 33 + 43 + 53
= ( 1+ 2+3+4+5)2
= 152
= 225
![](https://rs.olm.vn/images/avt/0.png?1311)
a) Ta có : A=2+22+23+...+210
=(2+22)+(23+24)+...+(29+210)
=2(1+2)+23(1+2)+...+29(1+2)
=2.3+23.3+...+29.3
Vì 3\(⋮\)3 nên 2.3+23.3+...+29.3\(⋮\)3
hay A\(⋮\)3
Vậy A\(⋮\)3.
![](https://rs.olm.vn/images/avt/0.png?1311)
Ta có :
4 mũ 3=4.4.4=64;8 mũ 2=8.8=64
Bởi vì 64=64 nên suy ra 4 mũ 3= 8 mũ 2
![](https://rs.olm.vn/images/avt/0.png?1311)
\(A=5+5^2+5^3+5^4+...+5^{39}+5^{40}\)
\(=\left(5+5^2\right)+\left(5^3+5^4\right)+...+\left(5^{39}+5^{40}\right)\)
\(=5\left(1+5\right)+5^3\left(1+5\right)+...+5^{39}\left(1+5\right)\)
\(=6\left(5+5^3+...+5^{39}\right)⋮6\)
Suy ra \(A⋮3,A⋮2\).
![](https://rs.olm.vn/images/avt/0.png?1311)
2x(3y-2)+(3y-2) = (2x+1)(3y-2) = -55.Lập bảng :
2x+1 | -55 | -11 | -5 | -1 | 1 | 5 | 11 | 55 |
3y-2 | 1 | 5 | 11 | 55 | -55 | -11 | -5 | -1 |
2x | -56 | -12 | -6 | -2 | 0 | 4 | 10 | 54 |
3y | 3 | 7 | 13 | 57 | -53 | -9 | -3 | 1 |
x | -28 | -6 | -3 | -1 | 0 | 2 | 5 | 27 |
y | 1 | 19 | -3 | -1 |
Vậy (x;y) = (-28;1);(-1;19);(2;-3);(5;-1)
\(a,6^3:6^2+94=6+94=100\\ b,135-5^4:5^2=135-5^2=135-25=110\\ c,7^3:7-4^5:4^3=7^2-4^2=49-16=33\\ d,8^7:8^4:8^2+8=8+8=16\)
câu b 5 mũ 4 vứt đi hả ANH