第1个回答 2015-09-12
(27)
x^2-10x-200=0
(x-20)(x+10)=0
x=230 or 10
(28)
x^2-10x+96=0
(x-8)(x-12)=0
x=8 or 12
(29)
x^2+23x+76=0
(x+4)(x+19)=0
x=-4 or -19
(30)
x^2-25x+154=0
(x-11)(x-14)=0
x=11 or 14
(31)
x^2-12x-108=0
(x-18)(x+6)=0
x=18 or -6
(32)
x^2+4x-252=0
(x+18)(x-14)=0
x=-18 or 14