y=300-3x+5(400+X^2)^1/2 这个函数怎么求导?
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y=300-3x+5(400+X^2)^1/2 这个函数怎么求导?
y=300-3x+5(400+X^2)^1/2 这个函数怎么求导?
y=300-3x+5(400+X^2)^1/2 这个函数怎么求导?
y=300-3x+5√(400+x²)
y'=-3+5*[1/2√(400+x²)]*(400+x²)'
y'=-3+5*[1/2√(400+x²)]*(2x)
y'=[5x/√(400+x²)]-3
y'=-3+5x*(400+x^2)^(-1/2)
y'=-3+[5/2(400+x"2)"-1/2 ]*2x "为平方
y=-3*1/2*5*2x*(400+X^2)^(-1/2)=-15(400+X^2)^(-1/2)
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