* 6 + 4 * = 56
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![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
6 x 4 = 24 4 x 6 = 24 24 : 6 = 4 24 : 4 = 6 | 8 x 5 = 40 5 x 8 = 40 40 : 8 = 5 40 : 5 = 8 | 7 x 8 = 56 8 x 7 = 56 56 : 7 = 8 56 : 8 = 7 |
![](https://rs.olm.vn/images/avt/0.png?1311)
1.
$(5^{1986}-5^{1985}):5^{1985}=5^{1985}(5-1):5^{1985}=5-1=4$
2.
\((7^{846}+7^{847}):7^{846}=7^{846}(1+7):7^{846}=1+7=8\)
3.
\((9^{2018}-3^{4036}):6^{2006}=[(3^2)^{2018}-3^{4036}]:6^{2006}\)
$=(3^{4036}-3^{4036}):6^{2006}=0:6^{2006}=0$
4.
$(7^{80}.8^{70}-56^{70}):56^{70}$
$=[7^{10}(7.8)^{70}-56^{70}]:56^{70}$
$=[7^{10}.56^{70}-56^{70}]:56^{70}$
$=56^{70}(7^{10}-1):56^{70}=7^{10}-1$
5.
$4^{4016}:(4^{4017}-4^{4016})=4^{4016}:[4^{4016}(4-1)]$
$=4^{4016}:4^{4016}:3=1:3=\frac{1}{3}$
6.
$(12^{206}.2^{207}-24^{206}):24^{206}$
$=(12^{206}.2^{206}.2-24^{206}):24^{206}$
$=[(12.2)^{206}.2-24^{206}]:24^{206}$
$=(24^{206}.2-24^{206}):24^{206}$
$=24^{206}(2-1):24^{206}=2-1=1$
7.
$(5^2-24)^{8946}+4^{30}:2^{60}=1^{8946}+(2^2)^{30}:2^{60}$
$=1+2^{60}:2^{60}=1+1=2$
8.
$(37.8^{1007}-7.2^{3021}):8^{1007}=[37.8^{1007}-7.(2^3)^{1007}]:8^{1007}$
$=[37.8^{1007}-7.8^{1007}]:8^{1007}$
$=8^{1007}(37-7):8^{1007}=37-7=30$
![](https://rs.olm.vn/images/avt/0.png?1311)
x + 34 = 56 - 6
x + 34 = 50
x = 50 - 34
x = 16
y + 56 = 78 + 4
y + 56 = 82
y = 82 - 56
y = 26
x + 32 = 345
x = 345 - 32
x = 313
y + 67 - 6 = 89 - 0
y + 67 - 6 = 89
y + 67 = 89 + 6
y + 67 = 95
y = 95 - 67
y = 28
x + 34 = 56 - 6
x + 34 = 50
x = 50 - 34
x = 16
y + 56 = 78 + 4
y + 56 = 82
y = 82 - 56
y = 26
x + 32 = 345
x = 345 - 32
x = 313
y + 67 - 6 = 89 - 0
y + 67 - 6 = 89
y + 67 = 89 + 6
y + 67 = 95
y = 95 - 67
y = 28
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
6 ´ 8= 48 |
28 : 4 = 7 |
35 : 5 = 7 |
7 ´ 9 = 63 |
56 : 7 = 8 |
4 ´ 6 = 24 |
5 ´ 4 = 20 |
42 : 6 = 7 |
36 : 6 = 6 |
3 ´ 8 = 24 |
45: 5 = 9 |
49 :7 = 7 |
![](https://rs.olm.vn/images/avt/0.png?1311)
6 x 7 = 42 (0,25đ) 48 : 6 = 8 (0,25đ)
7 x 4 = 28 (0,25đ) 56 : 7 = 8 (0,25đ)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
Lời giải chi tiết:
34 + 2 + 3 = 39 | 56 – 4 + 6 = 58 | 86 – 6 + 4 = 84 |
64 + 3 – 5 = 62 | 78 – 3 – 3 = 72 | 52 + 0 – 2 = 50 |
16 + 40 = 56
=> *1 = 1
*2 = 0
*6+4*=56=16+40=56