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Fenika1010
@Fenika1010
July 2022
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Решите уравнение: (x+141)+(x+134)+(x+127)+…+(x+1)=4200
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lidochka085
Пусть х+1=а₁ х+8=а₂
d=х+8-х-1=7
n=(x+141-x-1)/7 +1=21
S=(x+141+x+1)*21/2=4200
2x+142=4200*2/21
2x+142=400
2x=258
x=258/2
x=129
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Answers & Comments
d=х+8-х-1=7
n=(x+141-x-1)/7 +1=21
S=(x+141+x+1)*21/2=4200
2x+142=4200*2/21
2x+142=400
2x=258
x=258/2
x=129