6X2-7X+1=06X2-7X=-1X2-﹙7/6﹚X+﹙7/12﹚2=-1/6﹢﹙7/12﹚2﹙X-7/12﹚2=25/144∴X-7/12=±5/12∴X1=1,X2=1/65X2-18=9X5X2-9X=18X2-1
1∴X1=3,X2=-1
24X2-3X=52解:X2-﹙3/4﹚X=13﹙X-3/8﹚2=13∴X-3/8=±29/8∴X1=4,X2=-13/45X2=4-2X5X2+2X=4X2+0
9X1=-1,X2=0
8就这么几道,最好去百度搜索,那多1)x^2-9x+8=0答案:x1=8x2=1(2)x^2+6x-27=0答案:x1=3x2=-9(3)x^2-2x-80=0答案:x1=-8x2=10(4)x^2+10x-200=0答案:x1=-20x2=10(5)x^2-20x+96=0答案:x1=12x2=8(6)x^2+23x+76=0答案:x1=-19x2=-4(7)x^2-25x+154=0答案:x1=14x2=11(8)x^2-12x-108=0答案:x1=-6x2=18(9)x^2+4x-252=0答案:x1=14x2=-18(10)x^2-11x-102=0答案:x1=17x2=-6(11)x^2+15x-54=0答案:x1=-18x2=3(12)x^2+11x+18=0答案:x1=-2x2=-9(13)x^2-9x+20=0答案:x1=4x2=5(14)x^2+19x+90=0答案:x1=-10x2=-9(15)x^2-25x+156=0答案:x1=13x2=12(16)x^2-22x+57=0答案:x1=3x2=19(17)x^2-5x-176=0答案:x1=16x2=-11(18)x^2-26x+133=0答案:x1=7x2