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b,
=125-679+145-125+679
=(125-125)+(679-679)+145
=0+0+145
=145
chúc bạn học tốt
a) ( 17 - 229 ) + ( 17 - 25 + 229 )
= 17 - 229 + 17 - 25 + 229
= 34 - 25
= 9
b) ( 125 - 679 + 145 ) - ( 125 - 679 )
= 125 - 679 + 145 - 125 - 679
= ( 125 - 125 ) - ( 679 - 679 ) + 145
= 0 + 145
= 145
a)( 17-229)+(17-25+229)
=17-229+17-25+229
=34-25
=9
b)(125-679+145)-(125-679)
=125-679+145-125+679
=145
a) \(\left(17-229\right)+\left(17-25+229\right)\)
\(=17-229+17-25+229=9\)
b) \(\left(125-679+145\right)-\left(125-679\right)\)
\(=125-679+145-125+679=145\)
a.17-229+17-25+229
=(17+17)+(-229+229)+(-25)
=34+0+(-25)
=9
b.125-679+145-125+679
=(125-125)+(-679+679)+145
=0+0+145
=145
a)
17-229+17-25+229
=34-25+0
=9
b)
125-679+145-125+679
= 0 + 145 + 0
=145
a)17-229+17-25+229 b)125-679+145-125-629
=(17-17)+(229-229)+25 =(125-125)+(679-679)+145
=0+0+25 = 0+0+145
25 =145
a) ( 17 – 229) + ( 17 - 25 + 229)
= 17 - 229 + 17 - 25 + 229
= (17 + 17) + (- 229 + 229) - 25
= 34 + 0 - 25
= 9
b) ( 125 – 679 + 145) – ( 125 – 679 )
= 125 - 679 + 145 - 125 - 679
= ( 125 - 125 ) - ( 679 - 679 ) + 145
= 0 - 0 + 145
= 145
a, - ( 269 - 357 ) + ( 269 - 357 )
= - 269 + 357 + 269 - 357
= ( -269 + 269) + ( 357 - 357)
= 0
b, ( 123 + 345 ) + ( 456 - 123 ) - [ 2017 - ( - 345 ) ]
= 123 + 345 + 456 - 123 - [ 2017 + 345 ]
= 123 + 345 + 456 - 123 - 2017 - 345
= ( 123 - 123) + ( 345 - 345 ) + ( 456 - 2017)
= 0 + 0 + (-1561)
= - 1561
c, ( 17 - 229 ) + ( 17 - 25 + 229 )
= 17 - 229 + 17 - 25 + 229
= ( 17 + 17 ) + ( -229 + 229 ) - 25
= 34 + 0 - 25
= 9
d, ( 125 - 679 + 145 ) - ( 125 - 679 )
= 125 - 679 + 145 - 125 + 679
= ( 125 - 125 ) + (-679 + 679 ) + 145
= 0 + 0 + 145
= 145
Bai 1:
a) (x - 6)2 = 9
(x - 6)2 = 32
=> x - 6 = 3
x = 3 + 6
x = 8
Vay x = 8
b) (2x - 130) : 4 + 213 = 52 + 193
(2x - 130) : 4 + 213 = 25 + 193
(2x - 130) : 4 + 213 = 218
(2x - 130) : 4 = 218 - 213
(2x - 130) : 4 = 5
(2x - 130) = 5 . 4
(2x - 130) = 20
2x = 20 + 130
2x = 150
x = 150 : 2
x = 75
Vay x = 75
c) | 3x - 15| = 0
=> 3x - 15 = 0
3x = 0 + 15
3x = 15
x = 15 : 3
x = 5
Vay x = 5
Bai 2:
a) (17 - 229) + ( 17 - 25 + 229)
= 17 - 229 + 17 - 25 + 229
= 17 + (-229) + 17 + (-25) + 229
= [ 229 + (-229) ] + [17 + 17 + (-25) ]
= 0 + 9
= 9
b) - (269 - 357) + (269 - 357)
= - 269 + 357 + 269 - 357
= - 269 + 357 + 269 + (-357)
= [ 269 + (-269) ] + [ 357 + (-357) ]
= 0 + 0
= 0
c) (125 - 679 + 145) - (125 - 679)
= 125 - 679 + 145 - 125 + 679
= 125 + (- 679) +145 + (-125) + 679
= [ 679 + (-679) ] + [ 125 + (-125) ] + 145
= 0 + 0 + 145
= 145
a) \(17-229+17-25+299=79\)
b) \(125-679+145-125+679=145\)
a, 17-229+17-25+229 b. 125 - 679 + 145 - 125 + 679
= ( 17-17) + ( 229 - 229)+25 = ( 125 - 125) + ( 679 - 679) + 145
= 0+0+25
= 25