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liana5105
@liana5105
July 2022
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помогите с алгеброй!!!с полным решением!!!
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sedinalana
23
a1=1,,a8=15
S8=(a1+a8)*8/2=(1+15)*4=16*4=64
Ответ D
24
x-y=4
x=y+4
(y+4)²+y²=16
y²+8y+16+y²-16=0
2y²+8y=0
2y(y+4)=0
y1=0 U y2=-4
y1+y2=-4
ОтветC
25
y=2(x-1/4)²-1/8-6=2(x-1/4)-6 1/8
y∈[-6 1/8;∞)
Ответ B
26
sin(15+30)=sin45=√2/2
Ответ D
1 votes
Thanks 4
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Answers & Comments
a1=1,,a8=15
S8=(a1+a8)*8/2=(1+15)*4=16*4=64
Ответ D
24
x-y=4
x=y+4
(y+4)²+y²=16
y²+8y+16+y²-16=0
2y²+8y=0
2y(y+4)=0
y1=0 U y2=-4
y1+y2=-4
ОтветC
25
y=2(x-1/4)²-1/8-6=2(x-1/4)-6 1/8
y∈[-6 1/8;∞)
Ответ B
26
sin(15+30)=sin45=√2/2
Ответ D