(3.5-x)^2+(-0.5x^2+3.5x-3)^2=2.5^2怎么解?
4个回答
展开全部
(3.5-x)^2+(-0.5x^2+3.5x-3)^2=2.5^2
两边同时×4
(7-2x)^2+(-x^2+7x-6)^2=5^2
(2x-7)^2+(x^2-7x+6)^2=25
4x²-28x+49+x^4+49x²+36-14x³+12x²-84x=25
x^4-14x³+65x²-112x+60=0
1-14+65-112+60=0,有根x=1
x^4-x³-13x³+13x²+52x²-52x-60x+60
=(x-1)(x³-13x²+52x-60)=0
x=2代入,后面=8-13×4+52×2-60=0,有根x=2
(x-1)(x³-2x²-11x²+22x+30x-60)
=(x-1)(x-2)(x²-11x+30)
=(x-1)(x-2)(x-5)(x-6)
=0
解:
x1=1
x2=2
x3=5
x4=6
两边同时×4
(7-2x)^2+(-x^2+7x-6)^2=5^2
(2x-7)^2+(x^2-7x+6)^2=25
4x²-28x+49+x^4+49x²+36-14x³+12x²-84x=25
x^4-14x³+65x²-112x+60=0
1-14+65-112+60=0,有根x=1
x^4-x³-13x³+13x²+52x²-52x-60x+60
=(x-1)(x³-13x²+52x-60)=0
x=2代入,后面=8-13×4+52×2-60=0,有根x=2
(x-1)(x³-2x²-11x²+22x+30x-60)
=(x-1)(x-2)(x²-11x+30)
=(x-1)(x-2)(x-5)(x-6)
=0
解:
x1=1
x2=2
x3=5
x4=6
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2017-05-31
展开全部
(3.5-x)^2+(-0.5x^2+3.5x-3)^2=2.5^2
(7-2x)^2+(-x^2+7x-6)^2=25
(2x-7)^2+(x^2-7x+6)^2=25
(2x-7)^2+(x-1)^2(x-6)^2=25
3^2+4^2=5^2
x1=2,x2=1,x3=6, x=5
(7-2x)^2+(-x^2+7x-6)^2=25
(2x-7)^2+(x^2-7x+6)^2=25
(2x-7)^2+(x-1)^2(x-6)^2=25
3^2+4^2=5^2
x1=2,x2=1,x3=6, x=5
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