Question

十字相乘法 1.x²+9x+8 2.y²-7y+12 3.m²+7m-18 4.t

Answer 1

1.x²+9x+8

1 1

×

1 8

(x+1)(x+8)

2.y²-7y+12

1 -3

×

1 -4

(y-3)(y-4)

3.m²+7m-18

1 -2

×

1 9

(m-2)(m+9)

4.t²-2t-8

1 2

×

1 -4

(t+2)(t-4)

5.x²-10x+24

1 -4

×

1 -6

(x-4)(x-6)

6.x²-3x--10

1 2

×

1 -5

(x+2)(x-5)