数学函数的题目经常有求表达式,这是什么意思?-查字典问答网
李青茹
y=kx+b
y=ax^2+bx+c
y=1/x
x^2+y^2=r^2
x^2/a^2+y^2/b^2=1
x^2/a^2-y^2/b^2=1
等等。。。
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