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解法1(配方法):x²;+x-30=0x²;+2×(1/2)x+(1/2)²;-(1/2)²;-30=0(x+1/2)²;=30+1/4(x+1/2)²;=121/4x+1/2=±11/2x=(-1±)/2x1=(-1+11)/2=5x2=(-1-11)/2=-6解法2(因式分解法):x 178;+x-30…
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