Question

“十字相乘法”练习题,x平方+3x+2x平方-7x+6x平方+4x+3y平方-7y+12x平方-4x-21x平方+2x-

Answer 1

(x+1)(x+2)

(x-1)(x-6)

(x+1)(x+3)

(x-3)(x-4)

(x+3)(x-7)

(x-3)(x+5)

(q-2)(q-4)

(a+2)(a+5)

(m-2)(m+9)

(t+2)(t-4)

(p+4)(p-9)

(x-4)(x+5)

(x-y)(x-2y)