已知-½≤x≤1,化简√(x²-2x+1) +√(x²-6x+9 )+√(4x²+4x+1)
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已知-½≤x≤1,化简√(x²-2x+1)+√(x²-6x+9)+√(4x²+4x+1)已知-½≤x≤1,化简√(x²-2x+1)+√(x&
已知-½≤x≤1,化简√(x²-2x+1) +√(x²-6x+9 )+√(4x²+4x+1)
已知-½≤x≤1,化简√(x²-2x+1) +√(x²-6x+9 )+√(4x²+4x+1)
已知-½≤x≤1,化简√(x²-2x+1) +√(x²-6x+9 )+√(4x²+4x+1)
√(x²-2x+1) +√(x²-6x+9 )+√(4x²+4x+1)
=√(x-1)² +√(x-3)²+√(2x+1)²
∵-½≤x≤1
∴x-1≤0 x-3≤0 2x+1≥0
于是
原式=-(x-1)-(x-3)+2x+1
=-x+1-x+3+2x+1
=5
√(x²-2x+1) +√(x²-6x+9 )+√(4x²+4x+1)
=√(x-1)²+√(x-3)²+√(2x+1)²
=|x-1| + |x-3| + |2x+1|
= -(x-1) -(x-3) + 2x+1
= -x-x+2x+1+3+1
=4
原式=(1-x)+(3-x)+(2x+1)
=5