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x=aのときy=a^2
x=a+2のときy=a^2+4a+4
よってx,yの各々の増加量は
x:(a+2)-a=2
y:(a^2+4a+4)-a^2=4a+4
よって求める変化の割合は
4a+4/2=2a+2
これが6と等しくなればよいので
2a+2=6 2a=4 ∴a=2
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