45^20.5^20trên 75^15
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![](https://rs.olm.vn/images/avt/0.png?1311)
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a ) 25 - ( - 75 ) + 32 - ( 32 + 75
= 25 + 75 + 32 - 32 - 75
= 100 + 0 - 75
= 25
b ) 24 . ( 16 - 5 ) - 16 . ( 24 - 15 )
= 24 . 11 - 16 . 9
= 264 - 144
= 120
c ) 29 . ( 19 - 13 ) - 19 - ( 29 - 13 )
29 . 6 - 19 - 29 + 13
= 174 - 19 - 29 + 13
= 126 + 13
= 139
d ) ( 55 + 45 15 ) - ( 15 - 55 + 45 )
= 4570 - 15 + 10
= 4555 + 10
= 4565
![](https://rs.olm.vn/images/avt/0.png?1311)
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1045 + 57 - 1045 - 67
= ( 1045 - 1045 ) + ( 57 - 67 ) [_Tự lm tiếp_]
1890 - 456 - 434
= 1890 - ( 456 + 434 )
= 1890 - 890 [_Tự lm tiếp_]
-45 + 189 - 155
= 189 - ( 45 + 155 )
= 189 - 200 [_Tự lm tiếp_]
-127 + 34 - 73 + 166
= ( -127 + -73 ) + ( 34 + 166 ) [_Tự lm tiếp_]
-15 - 17 + 29 + 15 - 83
= ( -15 + 15 ) - ( 17 - 29 + 83 ) [_Tự lm tiếp_]
-45 + 140 - (-45) - 240
= [ -45 - ( -45 ) ] + ( 140 - 240 ) [_Tự lm tiếp_]
-75 + (-89) + (-75) + 89 - 122
= [ -75 + ( -75 ) ] + [ ( -89 ) + 89 ] - 122 [_Tự lm tiếp_]
P/s: Hoq chắc_:333
![](https://rs.olm.vn/images/avt/0.png?1311)
\(=\dfrac{\left(3^2\cdot5\right)^{10}\cdot5^{20}}{\left(3\cdot5^2\right)^{15}}=\dfrac{3^{20}\cdot5^{10}\cdot5^{20}}{3^{15}\cdot5^{30}}=3^5=243\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\dfrac{45^{10}.5^{20}}{75^{15}}\)
\(=\dfrac{9^{10}.5^{10}.5^{20}}{25^{15}.3^{15}}\)
\(=\dfrac{3^{20}.5^{30}}{5^{30}.3^{15}}\)
\(=3^5=243\)
![](https://rs.olm.vn/images/avt/0.png?1311)
4510.105/7515 = (32.5)10 . 520/(3. 52)15 = 320.530/315.530 = 35 = 243
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
45^20.5^20/75^15
=(45.5)^20/75^15
=225^20/75^15
=(75.3)^20/75^15
=75^20.3^20/75^15
=75^5.3^20
=75^5.(3^4)^5
=75^5.81^5
=(75.81)^5=6075^5
\(\frac{45^{20}.5^{20}}{75^{15}}=\frac{\left(3.15\right)^{20}.5^{20}}{75^{15}}\)
\(=\frac{3^{20}.15^{20}.5^{20}}{75^{15}}\)
\(=\frac{75^{20}.3^{20}}{75^{15}}\)
\(=\) \(75^5.3^{20}=8,274302827.10^{18}\)