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a: =387-87-224=300-224=76
b: =-75-25+329
=329-100=229
c: =-21-27+31+24=-48+55=7
d: =21(23+17)=21*40=840
e: =12-57+57-12
=0
f: =-6(36+64)=-6*100=-600
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. $=(31-21)-(27-24)=10-3=7$
Bài 2:
a: \(387+\left(-224\right)+\left(-87\right)\)
\(=\left(387-87\right)+\left(-224\right)\)
=300-224
=76
b: \(39+\left(13-26\right)-\left(62+39\right)\)
\(=39+13-26-62-39\)
\(=\left(39-39\right)+\left(13-26-62\right)\)
=0-75
=-75
c: \(32-34+36-38+40-42\)
\(=\left(32-34\right)+\left(36-38\right)+\left(40-42\right)\)
\(=\left(-2\right)+\left(-2\right)+\left(-2\right)\)
=-6
d: \(92-\left(55-8\right)+\left(-45\right)\)
\(=92-55+8-45\)
\(=\left(92+8\right)-\left(55+45\right)\)
=100-100
=0
e: -20<=x<=20
mà x nguyên
nên \(x\in\left\{-20;-19;-18;...;18;19;20\right\}\)
=>M={-20;-19;-18;-17;...;18;19;20}
Tổng các phần tử của M là:
\(\left(-20\right)+\left(-19\right)+\left(-18\right)+\left(-17\right)+...+18+19+20\)
\(=\left(-20+20\right)+\left(-19+19\right)+...+\left(-2+2\right)+\left(-1+1\right)+0\)
=0+0+...+0
=0
\(a,=251+\left(-151\right)+\left(-144\right)+\left(-216\right)=100+-360=-260\)
\(b,=-178+\left(-172\right)+58+350=-350+350+58=58\)
\(c,=\left(-37\right)+\left(-163\right)+\left(-70\right)+354+146=-270+500=230\)
\(d,=\left(-4795\right)+\left(-205\right)+3029+1971=-5000+5000=0\)
\(a)\)\(251+\left(-144\right)+\left(-151\right)+\left(-216\right)\)
\(=\)\(251+\left(-151\right)+\left(-144\right)+\left(-216\right)\)
\(=\)\(100+\left(-360\right)\)
\(=\)\(100-360\)
\(=\)\(-260\)
\(b)\)\(-359+181+\left(-123\right)+350+\left(-172\right)\)
\(=\)\(-178+\left(-172\right)+58+350\)
\(=\)\(-350+350+58\)
\(=\)\(0+58\)
\(=\)\(58\)
\(387+\left(-224\right)+\left(-87\right)\)
\(=\left(387+-87\right)+\left(-224\right)\)
\(=300-224=76\)
`387 +(-224)+(-87)`
`387+[(-224) +(-87)]`
`387+ (-311)`
`76`
a)387+(-224)+(-87)=[387+(-87)]+(-224)=300+(-87)=213
b)(-75)+329+(-25)=[(-75)+(-25)]+329=-100+329=229
e)251+(-114)+(-151)+(-216)=[251+(-151)]+[(-114)+(-216)]=100+(-330)=-230
j)(-137)+77+(-253)+37-47=[(-137)+37]+77+[(-253)-47]=-100+77-300=177-300=-123
a) bằng 300+(-224)=76 mới đúng