Bo ngoac roi tinh nhanh
( 18 + 29 ) + ( 158 - 18 - 29 )
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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
-144-[29-144+149]
=-144-29+144-149
=(-144+144)+(-29-149)
= 0 + (-178)
=-178
( 18 + 29 ) + ( 158 − 18 − 29 ) = 18 + 29 + 158 − 18 − 29 = ( 18 − 18 ) + ( 29 − 29 ) + 158 = 0 + 0 + 158 = 158.
27 + 514 - 486 + 73 = 128
10 - 12 - 9 - 1 = - 12
Tk mik mik làm nốt cho
Mik mới bị trừ 50 chục điểm bùn qúa T_T
\(\text{a) }\left(27+514\right)-\left(486-73\right)\)
\(=27+514-486+73\)
\(=\left(27+73\right)+\left(514-486\right)\)
\(=100+1000\)
\(=1100\)
\(\text{b) }\left(38-29+43\right)-\left(43+28\right)\)
\(=38-29+43-43-28\)
\(=\left(38-28\right)+\left(43-43\right)-29\)
\(=10+0-29\)
\(=10-29\)
\(=-19\)
\(\text{c) }\left(-245-12\right)-\left(18-245\right)\)
\(=-245-12-18+245\)
\(=\left(245-245\right)-\left(12+18\right)\)
\(=0-30\)
\(=-30\)
\(\text{d) }\left(327+414\right)-\left(-586-73\right)\)
\(=327+414+586+73\)
\(=\left(327+73\right)+\left(414+586\right)\)
\(=400+1000\)
\(=1400\)
- (-15) – (-3 +15 – 8)
= 15 + 3 - 15 + 8
= 11
b) + ( - 143 + 17 – 35) – ( -143 + 37 – 35)
= -143 + 17 - 35 + 143 - 37 + 35
= -20
c) 50 - ( 47 + 50 - 18 ) - ( 47 + 18 )
= 50 - 47 - 50 + 18 - 47 - 18
= -47 - 47
= -94
d) 16 - ( -15 ) + ( -20 ) - | -24 |
= 16 + 15 - 20 - 24
= -13
[144 - 97] - 144
= 144 - 97 - 144
= 0 - 97
= -97
[-145] - [18 - 145]
= 145 - 18 + 145
= 0 - 18
= -18
111 + [-11 + 27]
= 111 - 11 + 27
= 100 + 27
= 127
(144-97)-144=144-97-144= -97
(-145)-(18-145)=(-145)-18+145=-18
111+(-11+27)=111-11+27=127
( 18 + 29) + ( 158 - 18 - 29)
= 18 + 29 + 158 - 18 - 29
= ( 18 - 18) + ( 29 - 29) + 158
= 0 + 0 + 158
= 158
đung roi
18+29+158-18-29
=(18-18)+(29-29)+
=158