十字相乘法练习题 2 (1).2x 2 — 5x —12=0 (2) .3x2 — 5x — 2=0 ⑶.6x2 — 13x+5=0 ⑷.7x2 — 19x — 6=0 (5) .12x2 — 13x+3=0 (6) .4x2+24x+27=0 (7) .5x2+6x-8=0 (8) .2x2+3x+1=0 (9) .2y2+y— 6=0 (10) .6x2 — 13x+6=0 (11) .3a2 — 7a — 6=0 (12) .4n 2+4n — 15=0 (13) .6a2+a— 35=0 (14) ..x 2+2x-8 =0 (15) .x2+3x-10=0 (16) 5x2 — 8x — 13=0 (17) 4x 2 +15x+9=0 (18) 15x 2+x — 2=0 (19) 6y 2+19y+10=0 (20) 20 — 9y — 20y2=0 (21) .x2-x-20=0 (22) .x2+x-6=0 (31) .2x2+5x-3=0 (32) .6x2+4x-2=0 (33) .x2-2x-3 =0 (34) .x2+6x+8 =0 (35) .x2 -x-12=0 (36) .x2-7x+10 =0 (37) 2 .6x+x+2=0 (41).x(38) 2 .4x-8x+7=0 2+4x-3=0 (39) .x2-6x-7=0 (40) .x2+6x-7=0 (42).x + 8x+7=0 (43) .x2-5x+6=0 (44) .x2-5x-6=0 (45) .x2+5x-6=0 (46) .x2+5x+6=0 (47) .m2Mm-12=0 (48) .6x 2-5x-25=0 本文来源：https://www.wddqw.com/doc/2004a3d012a6f524ccbff121dd36a32d7275c7e6.html