Thực hiện phép tính: 23 . 75 + 25 . 23 + 180
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\(5^6\text{ : }5^4+2^3\cdot2^2-1^{2017}\)
\(=5^2+2^5-1\)
\(=25-32-1\)
\(=-7-1\)
\(=-8\)
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a, \(\dfrac{7}{15}\)+\(\dfrac{18}{54}\)
= \(\dfrac{7}{15}\)+ \(\dfrac{1}{3}\)
= \(\dfrac{7}{15}\)+\(\dfrac{5}{15}\)
= \(\dfrac{12}{15}\) = \(\dfrac{4}{5}\) =0,8
b, \(\dfrac{12}{25}\)+\(\dfrac{23}{75}\)-\(\dfrac{1}{4}\)
= \(\dfrac{59}{75}\) -\(\dfrac{1}{4}\)
= \(\dfrac{161}{300}\)
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a) 25 –[ 50 – ( 2 3 . 17 – 2 3 . 14 )]
= 25 – ( 50 – 2 3 . 3 ) = 25 – ( 50 – 24 )
= 25 – 26 = -1
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23 x 75 + 25 x 23 + 180
= 23 x (75 +25 ) +180
= 23 x 100 + 180
= 2300+180
=2480
ủng hộ mik nha
23×75+25×23+180
=23×75+25×23+ 25 + 130
= 23 x ( 75 + 23 + 2 ) + 130
= 23 x 100 + 130
=2300 + 120
=2420
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 25 –[ 50 – ( 2 3 . 17 – 2 3 . 14 )]
= 25 – ( 50 – 23 . 3 ) = 25 – ( 50 – 24 )
= 25 – 26 = -1
b) |-128| : [ 45 2 – ( 2010 – 2008 0 . 1 2010 )]
= 128 : [ 2025 – ( 2010 – 1 . 1 )] = 128 : ( 2025 – 2009 ) = 128 : 16 = 8
23 . 75 + 25 . 23 + 180
= 23 . (75 + 25) + 180
= 23 . 100 + 180
= 2300 + 180 = 2480