高一数学求解答方法及过程
2个回答
2016-09-20
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(1)
x≠0
(1+x)/x = 1/x + 1≠1
F{(1+x)/x} = (1+x²)/x²+1/x
= (1+2x+x²-2x)/x²+1/x
= {(1+x)²-2x}/x²+1/x
= (1+x)²/x² - 2x/x²+1/x
= {(1+x)/x}² - 1/x
= {(1+x)/x}² - (1+x-x)/x
= {(1+x)/x}²-(1+x)/x + 1
令x=(1+x)/x≠1
f(x)=x²-x+1 x≠1
(2)
√x≥0
√x+1≥1
f(√x+1)=x+2√x=(√x+1)²-1
令x=√x+1≥1:
f(x)=x²-1,x≥1
x≠0
(1+x)/x = 1/x + 1≠1
F{(1+x)/x} = (1+x²)/x²+1/x
= (1+2x+x²-2x)/x²+1/x
= {(1+x)²-2x}/x²+1/x
= (1+x)²/x² - 2x/x²+1/x
= {(1+x)/x}² - 1/x
= {(1+x)/x}² - (1+x-x)/x
= {(1+x)/x}²-(1+x)/x + 1
令x=(1+x)/x≠1
f(x)=x²-x+1 x≠1
(2)
√x≥0
√x+1≥1
f(√x+1)=x+2√x=(√x+1)²-1
令x=√x+1≥1:
f(x)=x²-1,x≥1
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