一定有实数根的是?1.x²+1=0 2.(x+1)²=m+1 3.(x-1)²=m+1 4.(x+1)²=m²+1
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![一定有实数根的是?1.x²+1=0 2.(x+1)²=m+1 3.(x-1)²=m+1 4.(x+1)²=m²+1](/uploads/image/z/5303364-60-4.jpg?t=%E4%B8%80%E5%AE%9A%E6%9C%89%E5%AE%9E%E6%95%B0%E6%A0%B9%E7%9A%84%E6%98%AF%3F1.x%26%23178%3B%2B1%3D0+2.%28x%2B1%29%26%23178%3B%3Dm%2B1+3.%28x-1%29%26%23178%3B%3Dm%2B1+4.%28x%2B1%29%26%23178%3B%3Dm%26%23178%3B%2B1)
一定有实数根的是?1.x²+1=0 2.(x+1)²=m+1 3.(x-1)²=m+1 4.(x+1)²=m²+1
一定有实数根的是?1.x²+1=0 2.(x+1)²=m+1 3.(x-1)²=m+1 4.(x+1)²=m²+1
一定有实数根的是?1.x²+1=0 2.(x+1)²=m+1 3.(x-1)²=m+1 4.(x+1)²=m²+1
1.x²+1=0→x²=-1 不成立 X
2..(x+1)²=m+1 因为(x+1)²大于等于0,若m