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a) \(13+22+\left(-20\right)+\left(-153\right)+8=13+22-20-153+8\)
\(=\left(13-153\right)+\left(22+8\right)-20=-140+30-20=-130\)
b) \(371+731+\left(-271\right)+\left(-281\right)=371+731-271-281\)
\(=\left(371-271\right)+\left(731-281\right)=100+450=550\)
c) \(9+\left(-10\right)+11+\left(-12\right)+13+\left(-14\right)+15+\left(-16\right)\)
\(=9-10+11-12+13-14+15-16\)
\(=\left(9-10\right)+\left(11-12\right)+\left(13-14\right)+\left(15-16\right)\)
\(=\left(-1\right)+\left(-1\right)+\left(-1\right)+\left(-1\right)=-4\)
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a) $371+731-271-531$
$=(371-271)+(731-531)$
$=100+200$
$=300$
b) $57+58+59+60+61-17-18-19-20-21$
$=(57-17)+(58-18)+(59-19)+(60-20)+(61-21)$
$=40+40+40+40+40$
$=40\cdot5$
$=200$
c) $9-10+11-12+13-14+15-16$
$=(9-10)+(11-12)+(13-14)+(15-16)$
$=-1+(-1)+(-1)+(-1)$
$=-1\cdot4$
$=-4$
$\text{#}Toru$
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a, 371+731-271-531
=(371-271)+(731-531)
=100+200
=300
b, A=1-3+5-7+...+97-99+101
A=(-1)+(-1)+...+(-1)+101{50 chữ số (-1)}
A=50.(-1)+101
A=(-50)+101
A=51
( Ai đi ngang qua cho mấy tick nha)
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371+731-271-531=(371-271)+(731-531)=100+200=300
tích mình nhé bạn !!!!!!!
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\(a.\)
\(\dfrac{2}{9}+\dfrac{-3}{10}+-\dfrac{7}{10}=\dfrac{2}{9}-1=\dfrac{2}{9}-\dfrac{9}{9}=-\dfrac{7}{9}\)
\(b.\)
\(\dfrac{-11}{6}+\dfrac{2}{5}+\dfrac{-1}{6}=\left(-\dfrac{11}{6}+-\dfrac{1}{6}\right)+\dfrac{2}{5}=-2+\dfrac{2}{5}=\dfrac{-10}{5}+\dfrac{2}{5}=\dfrac{-8}{5}\)
\(c.\)
\(-\dfrac{5}{8}+\dfrac{12}{7}+\dfrac{13}{8}+\dfrac{2}{7}=\left(-\dfrac{5}{8}+\dfrac{13}{8}\right)+\left(\dfrac{12}{7}+\dfrac{2}{7}\right)=1+2=3\)
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1:
a: \(=\dfrac{-4}{7}+\dfrac{4}{7}+\dfrac{3}{7}-\dfrac{23}{34}-\dfrac{4}{5}=\dfrac{3}{7}-\dfrac{23}{34}-\dfrac{4}{5}=-\dfrac{1247}{1190}\)
b:
Sửa đề: \(\dfrac{-5}{13}+\dfrac{4}{19}+\dfrac{-8}{13}+\dfrac{15}{19}+\dfrac{45}{6}\)
\(=\dfrac{-5}{13}-\dfrac{8}{13}+\dfrac{4}{19}+\dfrac{15}{19}+\dfrac{45}{6}=\dfrac{9}{2}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
Lời giải:
$A=(1-4)+(7-10)+(13-16)+....+(97-100)+103$
$=\underbrace{(-3)+(-3)+(-3)+...+(-3)}_{17}+103$
$=(-3).17+103=52$
a) 371 + 731 - 272 - 531
= (371 - 272) + (731 - 531)
= 99 + 200
= 299
b) -3 + 7 - 9 - 54 + 3 + 50 + 13
= (-3 + 3) + (7 + 13) - (54 +50) - 9
= 0 + 20 - 104 - 9
= 20 - 95
= -75
dang hoi ma