13+12 -12+34 -43=
Tính: a) (43 -13).(-3) +27.(-14 - 16); b) (-72).(34 -12) -34.(12 - 72).
Tính hộ mình nha :
Tính:
a) (43 -13).(-3) +27.(-14 - 16)
b) (-72).(34 -12) -34.(12 - 72).
a) (43 -13).(-3) +27.(-14 - 16) = -900
b) (-72).(34 -12) -34.(12 - 72) = 456
(12 + 23 + 34 + 45).(13+23+33+43).(38-812)
\(\left(1^2+2^3+3^4+4^5\right)\left(1^3+2^3+3^3+4^3\right)\left(3^8-81^2\right)\\ =\left(1^2+2^3+3^4+4^5\right)\left(1^3+2^3+3^3+4^3\right)\left[3^8-\left(3^4\right)^2\right]\\ =\left(1^2+2^3+3^4+4^5\right)\left(1^3+2^3+3^3+4^3\right)\left(3^8-3^8\right)\\ =\left(1^2+2^3+3^4+4^5\right)\left(1^3+2^3+3^3+4^3\right).0=0\)
\(\left(1^2+2^3+3^4+4^5\right)\left(1^3+2^3+3^3+4^3\right)\left(3^8-81^2\right)=\left(1^2+2^3+3^4+4^5\right)\left(1^3+2^3+3^3+4^3\right)\left(3^8-3^8\right)=\left(1^2+2^3+3^4+4^5\right)\left(1^3+2^3+3^3+4^3\right).0=0\)
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
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]
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
Tính
a) 25+(-13+8)
b) 7+(-12+43)-[2+(19-34)]
Thuc hien phep tinh
a) ( -5 ) + ( -9 ) + ( -12)
b) ( -8 ) + ( - 13 ) + ( -54 ) + ( -67 )
c) 12 + 38 - 30 - 22
d) 34 + ( -43 ) + 66 - 57
a)-26
b)-142
c)-2
d)0
a) Ta có: (-5)+(-9)+(-12)
=-(5+9+12)
=-26
b) Ta có: (-8)+(-13)+(-54)+(-67)
=(-8-54)+(-13-67)
=-62-80
=-142
c) Ta có: 12+38-30-22
=(12-22)+(38-30)
=-10+8
=-2
d) Ta có: 34+(-43)+66-57
=(34+66)-(43+57)
=100-100
=0
a,[ - 5 ] + [ - 9 ] + [ - 12 ]
= -[ 5 + 9 + 12 ]
= - 26
b, [ - 8] + [-13] + [-54] + [-67]
= [-8] + [-13] + [-52+2] + [-67]
= - { [ 8 + 54] + [13+67]}
= - { 62 + 80 }
= - 142
c, 12 + 38 - 30 - 22
= [12+38]-[30+22]
= 50 - 52
= - 2
d, 34 + [-43]+66-57
= 34 - 43 + 66 - 57
= [ 34 + 66 ] - [ 43 + 57 ]
= 100 - 100
= 0
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