(x,y)=(2,2)を通っているので、
2=a×2²
4a=2
a=1/2
y=1/2x²にそれぞれ代入して、
ア→2=1/2x² x²=4 x=2 A.ア=2
イ→1/2×1²=1/2 A.イ=1/2
ウ→3=1/2x² x²=6 x=√3 A.ウ=√3
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