若2x²+1与4x²-2x-5的值互为相反数,则X的值是?A.-1或2/3 B.1或-2/3 C.1或-3/2 D.1或3/2写的详细点,思路也写出来,急
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![若2x²+1与4x²-2x-5的值互为相反数,则X的值是?A.-1或2/3 B.1或-2/3 C.1或-3/2 D.1或3/2写的详细点,思路也写出来,急](/uploads/image/z/2734277-5-7.jpg?t=%E8%8B%A52x%26%23178%3B%2B1%E4%B8%8E4x%26%23178%3B-2x-5%E7%9A%84%E5%80%BC%E4%BA%92%E4%B8%BA%E7%9B%B8%E5%8F%8D%E6%95%B0%2C%E5%88%99X%E7%9A%84%E5%80%BC%E6%98%AF%3FA.-1%E6%88%962%2F3+B.1%E6%88%96-2%2F3+C.1%E6%88%96-3%2F2+D.1%E6%88%963%2F2%E5%86%99%E7%9A%84%E8%AF%A6%E7%BB%86%E7%82%B9%2C%E6%80%9D%E8%B7%AF%E4%B9%9F%E5%86%99%E5%87%BA%E6%9D%A5%2C%E6%80%A5)
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若2x²+1与4x²-2x-5的值互为相反数,则X的值是?A.-1或2/3 B.1或-2/3 C.1或-3/2 D.1或3/2写的详细点,思路也写出来,急
若2x²+1与4x²-2x-5的值互为相反数,则X的值是?A.-1或2/3 B.1或-2/3 C.1或-3/2 D.1或3/2
写的详细点,思路也写出来,急
若2x²+1与4x²-2x-5的值互为相反数,则X的值是?A.-1或2/3 B.1或-2/3 C.1或-3/2 D.1或3/2写的详细点,思路也写出来,急
若2x²+1与4x²-2x-5的值互为相反数,
则2x²+1+4x²-2x-5=0
6x²-2x-4=0
3x²-x-2=0
(3x+2)(x-1)=0
x1= -2/3 x=1
选择 B.1或-2/3
若2x²+1与4x²-2x-5的值互为相反数,
则2x²+1+4x²-2x-5=0
6x²-2x-4=0
(6x+4)(x-1)=0
则x=-4/6或x=1
所以x=-2/3或x=1
所以选B