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Bài làm
190 : { 950 : [ 225 - ( 165 - 25 . 2 ) ] } - 20170
= 190 : { 950 : [ 225 - ( 165 - 50 ) ] } - 1
= 190 : { 950 : [ 225 - 115 ] } - 1
= 190 : { 950 : 110 } - 1
= 190 : 95/11 - 1
= 190 x 11/95 - 1
= 22 - 1
= 21
# Học tốt #
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(3.5)^2-(16x2)^2=3^2x5^2-16^2x2^2=9x25-256x4=225-1024=-799
(39.42-37.42):42=[42.(39-37)]:42=42x2:42=1x2=2
2448:[190-(23-6)]=2448:[190-17)=2448:173=2448/173 nha Dương Ngọc Phuong Linh
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a) − 105 + − 25 + ( − 105 ) + 50
= 105 + 25 + ( - 105) + 50
= [105 + ( -105)] + ( 25 + 50 )
= 0 + 75 = 75
b) 465 + − 38 + − 465 − 12 − − 42
= 465 + ( - 38) + ( -465) – 12 – 42
= [ 465 + (- 465) ] – ( 12 + 42 )
= 0 – 54 = 0 + ( -54 ) = -54
c) 65. − 19 + − 19 .24 + − 19 .11
= ( - 19) . ( 65 + 24 + 11 )
= ( -19) . 100 = -1900
d) − 3 2 + 2 3 − − 5 2 + 4 3
= 9 + 8 – 25 + 64 = 56
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23 . 75 + 25 . 23 + 180
= 23 . (75 + 25) + 180
= 23 . 100 + 180
= 2300 + 180 = 2480
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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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a) 3 4 : 2 3 : 3 5 = 3 4 . 3 2 . 5 3 = 15 8
b) 3 4 : 2 3 : 3 5 = 3 4 : 2 3 . 5 3 = 3 4 : 10 9 = 3 4 . 9 10 = 27 40
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\(=\dfrac{9}{23}\left(\dfrac{5}{17}-\dfrac{22}{17}\right)+11+\dfrac{9}{23}=11\)
=190:{ [ 950:[225-( 165-130)]}-20170+23.23
=190:{ [ 950:[225-35]}-20170+23.23
=190:{ 950:190}-20170+23.23
=190:5-20170+23.23
=190:5-1+23+3
=190:5-1+26
=190:5-1+64
=38-1+64
=39+64
=103