bo ngoac roi tinh:a)30+12+(-20)+(-12) ;b)(-5)+(-10)+16+(-1)
bo ngoac roi tinh:-(21+32)-(-12+32)
(21 + 32) - (-12 + 32)
= 21 + 32 + 12 - 32
= (32 - 32) + (21 + 12)
= 0 + 33
= 33
- ( 21 + 32 ) - ( - 12 + 32 )
= ( - 21 ) + 32 - ( - 12 ) - 32
= ( - 21 ) + 32 + 12 - 32
= 11 + 12 - 32
= 23 - 32
= - 9.
-(21+32)-(-12+32) bo ngoac roi tinh
-(21+32)-(-12+32)
= - 21 - 32 + 12 - 32
= ( - 21 + 12 ) + ( - 32 - 32 )
= - 9 - 62
= - 71
!!! k chắc
-(21+32)-(-12+32)
=-21-32-(-12)-32
=-21+(-32)+12+(-32)
=-21+12+(-32)+(-32)
=(-9)+(-64)=(-73)
Chúc bn học tốt
(− 21 − 32) − (−12 + 32)
= −21 + 32 + 12 − 32
= −21 + 12 + 32 − 32
= −9 + 0
= −9
nhớ k cho mình nha'
học tốt
Bo dau ngoac roi tinh
10-[12-(-9-1)]
10 - [12 - (-9 - 1)]
= 10 - 12 + (-9) - 1
= (-2) + (-9) - 1
= (-11) - 1
= (-12)
10-12+9+1
=-2+9+1
=7+1
=8
10-[12-(-9-1)]
=10-12-9-1
=-2-9-1
=-12
Bo dau ngoac roi rut gon bieu thuc :
a) - ( - 12 + 25 - 36 ) - ( 12 - 36 + 57 )
b) - ( 23 + 5 - 6 + 17 ) + ( 23 - 5 - 83 - 6 )
c) 12 . ( 6 - 7 - 8 ) - 10 . ( 11 + 12 - 13 )
Giup minh voi minh dang can rat gap
a. = 12 - 25 + 36 - 12 + 36 - 57
= (12 - 12) + (36 + 36) - (25 + 57)
= 0 + 72 - 82
= -10
b. = -23 - 5 + 6 - 17 + 23 - 5 - 83 - 6
= (-23 + 23) + (-5 - 5) + (6 - 6) - (17 + 83)
= 0 + (-10) + 0 - 100
= -110
c.?
[27+514]-[486-73]
10-[12-[-9-1]]
[38-29+43]-[43+38]
271-[[-43]+271-[-17]]
-144-[29-[+144]-[+144]]
bo ngoac roi tinh
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
[27 + 514] - [486 - 73]
= 27 + 514 - 486 + 73
= (27 + 73) + ( 514 - 486)
= 100 + 28
= 128
10 - [12 - [-9 -1]]
= 10 - 12 - 9 - 1
= -12
[38 - 29 + 43] - [43 + 38]
= 38 - 29 + 43 - 43 - 38
= (38 - 38) - 29 + (43 - 43)
= 0 - 29 + 0 = -29
Bo ngoac roi rut gon:-a-(b-a-c)
7,1+(-5,25)-(-2,25+7,1)
Bo ngoac roi tinh
\(7,1+\left(-5,25\right)-\left(-2,25+7,1\right)\)
\(=7,1-5,25+2,25-7,1\)
\(=\left(7,1-7,1\right)-\left(5,25-2,25\right)\)
\(=0+3\)
\(=3\)
Ủng hộ mk nha ^_-
Bo ngoac roi tinh
(2.17,5-2015)-(-2015+17,5.2)-14
(2 * 17,5 - 2015) - (-2015+ 17,5 *2) -14
= 2*17,5 - 2015 +2015 - 17,5 *2 -14
=0-14
=-14
Bo ngoac roi tinh nhanh
( 18 + 29 ) + ( 158 - 18 - 29 )
18+29+158-18-29
=(18-18)+(29-29)+
=158