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a) 27 . 75 + 25 . 27 - 150
= 27 . ( 75 + 25 ) - 150
= 27 . 100 - 150
= 2700 - 150
= 2550
b) 12 : { 390 : [ 500 - ( 125 + 35 . 7 ]}
= 12 : { 390 : [ 500 - ( 125 + 245 )]}
= 12 : { 390 : [ 500 - 370 ]}
= 12 : { 390 : 130 }
= 12 : 3
= 4
a) 27 . 75 + 25 . 27 - 150
= 27 . ( 75 + 25 ) - 150
= 27 . 100 - 150
= 2700 - 150
= 2550
b) 12 : { 390 : [ 500 - ( 125 + 35 . 7 ]}
= 12 : { 390 : [ 500 - ( 125 + 245 )]}
= 12 : { 390 : [ 500 - 370 ]}
= 12 : { 390 : 130 }
= 12 : 3
= 4
a 27 . 75 + 25 . 27 - 150
= 27 . ( 75 + 25 ) - 150
= 27 . 100 - 150
= 2700 - 150
2550
b ) 12 : { 390 : [ 500 - ( 125 + 35 . 7 ) ] }
= 12 : { 390 : [ 500 - ( 125 + 245 ) ] }
= 12 : { 390 : [ 500 - 370 ] }
= 12 : { 390 : 130 }
= 12 : 3
= 4
a) 27.75+26.27-150=27(75+25)-150
= 2700-150
= 2550
b) = 12: {390:[500-370]
= 12:{390:130}
=12:3
=4
a)27.75+25.27-150
=27.(75+25)-150
=27.100-150
=2700-150
=2550
b)12:{390:[500-(125+35.7)]}
=12:{390:[500-(125+245)]}
=12:{390:[500-370]}
=12:{390:130}
=12:3
=4
a, 27.75+ 25.27-150 b,
= 27.(75 +25) -150
=27.100-150
=2700-150
=2550
a) \(27\cdot75+25\cdot27-150\)
\(=27\cdot\left(75+25\right)-150\)
\(=27\cdot100-150\)
\(=2700-150\)
\(=2550\)
b) \(12:\left\{390:\left|500-\left(125+35\cdot7\right)\right|\right\}\)
\(=12:\left\{390:\left|500-\left(125+245\right)\right|\right\}\)
\(=12:\left\{390:\left|500-370\right|\right\}\)
\(=12:\left\{390:130\right\}\)
\(=12:3\)
\(=3\)
a) 5.16 - 18.9 = 80 - 162 = -82
b) 27.18 - 27.12 = 27.(18-12) = 27.6 = 162
c) 39.213 + 87.39 = 39.(213+87) = 39.300 = 11700
d) 180 - [130-(82-40)] = 180 - ( 130 - 42 ) = 180 - 88 = 92
e) 12 : {390:[500-(125+35.7)]}
= 12 : {390:[500-(125+245)]}
= 12 : {390:[500-370]}
= 12 : ( 390 : 130 )
= 12 : 3
= 4
=12 : { 390 : [ 500 - ( 125 +245) ] }
= 12 : { 390 : [ 500- 370 ] }
= 12 : { 390 : 130 }
= 12 : 3
= 4
a)80-[130-(12-40)2] b)27.75+25.27-150 c)12:{390:[500-(125+35.7)]}
=80-[130-(-28)2] =27.(75+25)-150 =12:{390:[500-(125+245)]}
=80-[130-784] =27.100-150 =12:{390:[500-370]}
=80-(-654) =2700-150 =12:{390:130}
=80+654 =2550 =12:3
=734 =4
Nhớ **** thanks so much^__^