7 + ( -12 + 43) - [ 2 + (19 - 34)]
7+(-12+43)-[2+(19-34)]
7 + (-12 + 43) - [2 + (19 - 34) ]
= 7 + 31 - [ 2 + (-15)]
= 38 - (-15)
= 53
Tính 7+(-12+43)-[ 2+(19-34)]
7+(-12+43)-[ 2+(19-34)]
= 7 + (-12 + 43 ) - [ 2 + ( 19 - 34 ) ]
= 7 + 32 - [ 2 + ( -15 ) ]
= 7 + 32 - ( - 13 )
= 39 - ( - 13 )
= 52
7 + (-12 + 43) - [ 2 + (19 - 37) ]
= 7 + 31 - [2 + (-15) ]
= 38 - (-13)
= 51
7+(-12+43)-[2+(19-34)]
\(\Rightarrow7+31-\left[2+\left(-15\right)\right]\)
\(\Rightarrow7+31-\left(-13\right)=7+31+13=20+31=51\)
\(7+\left(-12+43\right)-\left[2+\left(19-34\right)\right]\)
\(=7+31-\left[2+\left(-15\right)\right]\)
\(=7+31-\left(-13\right)\)
\(=38+\left(-13\right)\)
\(=25\)
25+(-13+8)
7+(-12+43)-[2+(19-34)]
a, 25+ ( - 13 + 8 )
= 25+ ( -5 ) = 20
b, 7 + ( - 12 + 43 ) - [ 2 + (19 - 34)]
= 7 + 31 - [ 2 + ( - 15 ) ]
= 7 + 31 - ( - 13 )
= 38 - ( - 13 )
= 51
tk cho mk nha
Tính:
7+(-12+ 43)- [2+(19- 34)]
7+(-12+ 43)- [2+(19- 34)]=7+31- [2+(-15)]
=7+31-(-13)
=38-(-13)=51
7+(-12+ 43)- [2+(19- 34)]
=7+31-[2+(-15)]
=7+31-(-13)
=38-(-13)
=51
7+(-12+ 43)- [2+(19- 34)]
=7+31-[2+(-15)]
=7+31-(-13)
=38-(-13)
=51
a) 25+( -13 +8) =
b) 7+( -12 +43) - [ 2+( 19-34)]
a)25+(-13+8)
=25+(-5)=20
b)7+(-12+43)-[2+(19-34)]
=7+31-[2+(-15)]
=7+31-(-13)
=25
a) 25+(-13+8)
b) 7+(-12+43)-[2+(19-34]
Bỏ dấu ngoặc rồi tính :
7 + (-12+43) - [2+(19-34)]
7-12+43-(2+19-34)
=7-12+43-2-19+34
=(7+43)-(12+2)-19+34
=50-14-19+34
=36-19+34
=17+34
=51
1. Tính:
a) 25 + ( - 13 + 8 );
b) 7 + ( - 12 + 43 ) - [ 2 + ( 19 - 34)]
a) 25 + ( - 13 + 8 )
= 25 + (-5)
= 20
b) 7 + ( - 12 + 43 ) - [ 2 + ( 19 - 34)]
= 7 + (-12 + 43 ) - [ 2 + (-15) ]
= 7 + 31 - (-13)
= 7 + 31 + 13
= 38 + 13
= 51