(20.2^4 - 12.2^3 - 48.2^2)^2 : (-8)^3
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![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\left(20.2^4-12.2^3-48.2^2\right)^2:\left(-8^3\right)\)
\(=\left(20.16-12.8-48.4\right)^2:\left(-512\right)\)
\(=\left(320-96-192\right)^2:\left(-512\right)\)
\(=\left(224-192\right)^2:\left(-512\right)\)
\(=32^2:\left(-512\right)\)
\(=\left(32^2:-512\right)\)
\(=\left(1024:-512\right)\)
\(=-2\)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) (-1).(-2)-(-3).(-4)-(-2).(-3)
=(-2)-(-12)-(-6)
=10-(-6)
=10+6
=16
b) (-2).(-30):(-1)-(-3).(-2):(-6)+(-2)
=6:(-1)-6:(-6)+(-2)
= (-6)-(-1)+(-2)
=(-5)+(-2)
= -7
c) (20.2^4-12.2^3-48.2^2)^2:(-8)^3
=(20.16-12.8-48.4)^2:(-8)^3
=(320-96-192)^2:(-8)^3
=(224-192)^2:(-8)^3
=(32)^2:(-8)^3
=1024:(-521)
= -2
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\left(20.2^4+12.2^4-48.2^2\right):8^2=\left(20.2^4+12.2^4-12.2^2.2^2\right):8\)
\(=\left(20.2^4+12.2^4-12.2^4\right):2^6=2^4.\left(20+12-12\right):2^6\)
\(=2^4.20:2^6=2^4.2^2.5:2^6=2^6.5:2^6=5\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\Rightarrow\)(20.16+12x16-48.4):64=(16.(20+12)-192):64=(16.32-192):64=320:64=5
mình có cách ngắn hơn nhưng khó hiểu lắm nên tích đúng cho mình nha
![](https://rs.olm.vn/images/avt/0.png?1311)
(20.24+12.24_48.22)÷82
=(20.16+12.16-48.4)÷64
={[16.(20+12)]-48.4}÷64
=(16.32-48.4)÷64
=(512-192)÷64=320÷64=5
(20.24+12.24_48.22)÷82
= (20.16 + 12.16-48.4):82
= 156: 82
=156:64
=2,4375
![](https://rs.olm.vn/images/avt/0.png?1311)