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сашасерый5

Объяснение:

x^2+(x+a)^2=16

2x^2+2ax+(a^2-16)=0

D=0; 4a^2-8(a^2-16)=0

4a^2-8a^2+128=0

4a^2=128

a^2=32

a=4*sqrt(2)

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