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y+3=√2x-5+√10-4x=√(2x-5)+√2(5-2x) 因為根號下式子≥0 所以有 2x-5≥0 2(5-2x)≥0 所以得2x-5=0 即x=5/2 y=√2x-5+√10-4x-3=0+0-3=-3 所以2xy=2×5/2×(-3)=-15
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