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Bài 2:
a. $=62-81-12+59-9=(62-12)+(59-9)-81$
$=50+50-81=100-81=19$
b. $=39+13-26-62-39=(39-39)+13-(26+62)$
$=0+13-88=-(88-13)=-75$
c. $=(32-42)+(36-34)+(40-38)=10+2+2=14$
d. $=92-55+8-45=(92+8)-(55+45)=100-100=0$
Bài 1:
a. $=(387-87)-224=300-224=76$
b. $=-(75+35)+379=-110+379=379-110=269$
c. $=(11+15)-(13+17)=25-30=-5$
d. $=(31-21)-(27-24)=10-3=7$
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-35+35.(-74)-35.25
= -35.1+35.(-74)-35.25
= 35.( -1 )+35.(-74)-35.25
= 35 . [ ( -1 ) + ( -74 ) - 25 ]
= 35 . ( - 100 )
= -3500
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a)
8 19 + 4 21 + 2 5 + 17 21 + − 27 19 = 8 19 + − 27 19 + 4 21 + 17 21 + 2 5 = − 1 + 1 + 2 5 = 2 5
b)
− 5 18 + 7 4 − − 2 3 + 5 6 = − 10 36 + 63 36 + 24 36 + 30 36 = 107 36
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a) -187 + (-1907) - ( 1706 - 619 - 581 )
= -187 + (-1907) - 1706 + 619 + 581
= -187 +(-1907) + (-1706) + 619 + 581
= [-187 + (-1907) + (-1706)] + (619 +581)
= -3800 + 1200
= -2600
b) 1 - 2 - 3 + 4 + 5 - 6 - 7 + 8 +.....+ 2013 - 2014 - 2015 +2016
= (1-2-3+4) + (5-6-7+8) + .............+ (2013-2014-2015+2016)
=0 + 0 +.........+0
=0
a) -187 + (-1907) - ( 1706 - 619 - 581 )
=-187 + (-1907) -1706 + 619 + 581
=........
=.....
=-3800 + 1200
=-2600
b) 0
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a: \(-81\cdot36+\left(-81\right)\cdot63-81\)
\(=36\cdot\left(-81\right)+63\cdot\left(-81\right)+\left(-81\right)\)
\(=-81\left(36+63+1\right)\)
\(=-81\cdot100=-8100\)
b: \(23\cdot\left(-38+123\right)-123\cdot\left(23-38\right)\)
\(=-23\cdot38+23\cdot123-123\cdot23+123\cdot38\)
\(=123\cdot38-23\cdot38=38\left(123-23\right)=38\cdot100=3800\)
=(-259+259)+[(-74)+(-26)]+(-81+581)
=0+(-100)+500
=400
= -259 + 259 - 74 - 26 + 581 + 259 - 81
= 0 - 100 + 840 - 81
= 659