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b. 7 + (-12 + 43) - [2 + (19 - 34)]
= 7+31- [2+(-15)]
= 7+31-(-13)
= 51
\(a.7+\left(-12+43\right)-\left[2+\left(19-34\right)\right]\)
\(=7+31-\left[2+\left(-15\right)\right]\)
\(=7+31-\left(-13\right)\)
\(=38-\left(-13\right)\)
\(=51\)
\(b.25+\left(-13+8\right)\)
\(=25+\left(-5\right)\)
\(=20\)
\(c.\left(-8\right)-\text{ }\left[\left(-4\right)+6\right]\)
\(=\left(-8\right)-2\)
\(=\left(-10\right)\)
\(d.\left(-8\right)+4-6\)
\(=\left(-4\right)-6\)
\(=\left(-10\right)\)
a, -321 + (-29 ) - 142 - (-72) = -321 - 29 - 142 + 72 = -420.
b, 214 - (-36) + (-305) = 214 + 36 - 305 = -55.
c, 232 - (581 + 132 - 331) = 232 - 581 - 132 + 331 = -150.
d, [ 12+ (-57)] - [-57 - (-12) = 12 - 57 + 57 - 12 = 0.
214+[120-(214+120)]
=214+120-(214+120)
=214+120-214-120
=(214-214)+(120-120)
=0+0=0
(-321)-[(-321+35)-235]
=(-321)-(-321+35)+235
=(-321)+(-321-35)-235
=-321-(-321) +(235-35)
=0+200
=200
(18+29)+(158-29-18)
=18+29+158-29-18
=(18-18)+(29-29)+158
=0+0+158
=158
(13-135+49)-(13+49)
=13-135+49-13-49
=(13-13)+(49-49)-135
=0-135
= -135
25+(-13+8)
=25+(-5)
=20
7+(-12+43)-[2+(19-34)]
=7+31-[2+(-15)]
=7+31-(-13)
=38+(-13)
=25
nhiều quá, mk phụ chút thôi
1.a)214+[120-(214+120)=214+120-214-120=(214-214)+(120-120)=0+0=0
b)(-321)-[(-321+35)-235]=(-321)+321-35+235=[(-321)+321]+(235-35)=0+200=200
2.a)(18+29)+(158-29-18)=18+29+158-29-18=(18-18)+(29-29)+158=0+0+158=158
1/
200-(120-30+40) 7+(-12+43)-[2+(19-34)]
=200-(90+40) =7+31-[2+(-15)]
=200-130 =7+31-13
=70 =7+18
=25
2/
a) 214+[120-(214+120)]
=214+120-(214+120)
=(214+120)-(214+120)
=334-334
=0
a) \(\left|x\right|+2=2^3.\left(-2\right)^2\)
\(\Leftrightarrow\)\(\left|x\right|+2=32\)
\(\Leftrightarrow\)\(\left|x\right|=30\)
\(\Leftrightarrow\)\(x=\pm30\)
Vậy...
b) \(\left|x\right|+4=\left(-3\right)^2+\left(-2\right)\)
\(\Leftrightarrow\)\(\left|x\right|+4=7\)
\(\Leftrightarrow\)\(\left|x\right|=3\)
\(\Leftrightarrow\)\(x=\pm10\)
Vậy...
b2 :
a) 5 . ( -5 - 6 )
= 5 . ( -11 )
= -55
b) 321 + { - 15 + [ 30 + ( -321 ) ] }
= 321 + { - 15 + [ - 291 ] }
= 321 + ( - 306 )
= 15
19 . 92 - 9 . ( - 19 ) - 19
= 1748 - ( -171 ) - 19
= 1919 - 19
= 1900
a) 214 + [ 120 - ( 214 + 120 ) ]
= 214 + [ 120 + ( -120 ) + ( -214 ) ]
= 214 + [ 0 + (-214 ) ]
= 214 + ( -214 )
= 0
b) ( - 321 ) - [ ( -321 + 35 ) - 235 ]
= -321 ) - [ ( -321 ) + ( -35 ) + 235 ]
= -321 - [ -321 + 200 ]
= -321 + 321 + 200
= 0 + 200
= 200
a)214+[120-(214+120)]
=214+120-214-120
=[(-214)+214]+[120+(-120)]
=0+0=0
a)
-11
B)
-566
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