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
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