两题求解谢谢
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解
∵-2≤x<1
∴x-1<0
x+2≥0
3√x^2-2x+1-√x^2+4x+4
=3√(x-1)^2-√(x+2)^2
=3/x-1/-/x+2/
=-3(x-1)-(x+2)
=-3x+3-x-2
=-4x+1
稍等
∵-2≤x<1
∴x-1<0
x+2≥0
3√x^2-2x+1-√x^2+4x+4
=3√(x-1)^2-√(x+2)^2
=3/x-1/-/x+2/
=-3(x-1)-(x+2)
=-3x+3-x-2
=-4x+1
稍等
追答
12
∵1<x≤7
∴x-7≤0
1-x<0
√x^2-14x+49-√(1-x)^2/(1-x)
=√(x-7)^2-|1-x|/(1-x)
=|x-7|-|1-x|/(1-x)
=-(x-7)+(1-x)/(1-x)
=-x+7+1
=-x+8
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