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a, 2 17 + 17 2 9 15 - 3 15 2 4 - 4 2
= 2 17 + 17 2 9 15 - 3 15 16 - 16
= 2 17 + 17 2 9 15 - 3 15 . 0
= 0
b, 1 2 + 2 3 + 3 4 + 4 5 . ( 1 3 + 2 3 + 3 3 + 4 3 ) ( 3 8 - 81 2 )
= 1 2 + 2 3 + 3 4 + 4 5 . ( 1 3 + 2 3 + 3 3 + 4 3 ) ( 3 4 . 2 - 81 2 )
= 1 2 + 2 3 + 3 4 + 4 5 . ( 1 3 + 2 3 + 3 3 + 4 3 ) ( 81 2 - 81 2 )
= 1 2 + 2 3 + 3 4 + 4 5 . ( 1 3 + 2 3 + 3 3 + 4 3 ) . 0
= 0
c, 7 24 + 7 23 : 7 22
= 7 24 : 7 22 + 7 23 : 7 22
= 7 24 - 22 + 7 23 - 22
= 7 2 + 7 1
= 49 + 7 = 56
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B) 42.53+47.156-47.114
=42.53+47(156-114)
=42.53+47.42
=42(53+47)
=42.100
=4200
341.67+341.6+659.83
=341.(67+6)+659.83
=341.83+659.83
=(341+659).83
=1000.83
=83000.
42.53+47.156-47.114
=42.53+47.(156-114)
=42.53+47.42
=42.(53+47)
=42.100.
NẾU ĐÚNG THÌ K OK OK OK OK
=4200
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a) 1,2.2,5 = 3;
125 : 0,25 = 500
b)
\(1,2.2,5 = \dfrac{6}{5}.\dfrac{5}{2} = \dfrac{{30}}{{10}} = 3\)
\(125:0,25 = 125:\dfrac{1}{4} = 125.4 = 500\)
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234456
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ĐÂY NHÉ !!! ĐÚNG CHO MK LIKE NHEN !!!
\(\frac{\left(3.4.4^4-2.4^5\right)}{4^5}=\frac{\left(3.4^5-2.4^5\right)}{4^5}=\frac{4^5.\left(3-2\right)}{4^5}=1.\)
( 12.44- 2.45 ) :45
= ( 3. 45- 2.45):45
=(45.(3-2) ) :45
=45:45
=1