因式分解之十字相乘法专项练习题二次项系数为 1232x672x2142x152x8624x342x1072a1272y 862q20x 1872m3652p82t 204x 872ax22149ba2218yx2265xyxaa12432348xx二次项系数不为 1032x372x 3)(4)(2ba223yx5762x 22865yx7152x 4832a6752x8x2+6x35 4m2+8m+3 5x28x1310235ab1542n3562l2210yx22158nm 221073yxab
