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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) (125 - 679 + 145) - (125 - 679)
= 125 - 679 + 145 - 125 + 679
= ( 125 - 125) - (679 - 679) + 145
= 0 - 0 + 145
= 145
a, (125 - 679 + 145) - (125 - 679)
125-679+145-125+679
=(125-125)+(-679+679)+145
=0+0+145
=145
b, -37 + 54 + (-70) + (-163) + 246
=[-37+(-70)+(-163)]+(54+246)
=[-107+(-163)]+300
=-270+300
=30
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
b,
=125-679+145-125+679
=(125-125)+(679-679)+145
=0+0+145
=145
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Bài 10:
a: x-5=-1
=>x=-1+5
=>x=4
b: x+30=-4
=>x=-4-30
=>x=-34
c: x-(-24)=3
=>x+24=3
=>x=3-24
=>x=-21
d: 22-(-x)=12
=>22+x=12
=>x=12-22
=>x=-10
e: (x+5)+(x-9)=x+2
=>x+5+x-9=x+2
=>2x-4=x+2
=>2x-x=4+2
=>x=6
f: (27-x)+(15+x)=x-24
=>x-24=27-x+15+x=42
=>x=42+24
=>x=66
Bài 9:
a: 15-(4-x)=6
=>4-x=15-6=9
=>x=4-9=-5
b: -30+(25-x)=-1
=>-30+25-x=-1
=>-5-x=-1
=>x+5=1
=>x=1-5
=>x=-4
c: x-(12-25)=-8
=>x-(-13)=-8
=>x+13=-8
=>x=-8-13
=>x=-21
d: (x-29)-(17-38)=-9
=>x-29-(-21)=-9
=>x-29+21=-9
=>x-8=-9
=>x=-9+8
=>x=-1
Bài 8:
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, 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
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
(125 - 679 + 145) - (125 - 679)
= 125 - 679 + 145 - 125 + 679
= 125 - 125 - 679 + 679 + 145
= 145
=-409 - -554
=145
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