Question

因式分解例题

十字相乘法，分组分解法各十题

Answer 1

十字相乘法十题:
2X²+3x+1; 6X²-5x-6; X²+5x+6; 6X²-14x+8; X²-x-6; 5X²+9x-2; 7X²+2x-5; 4X²+x-14; 3X²-5x-2;
9X²+10x-16.
分组分解法十题:
X²-xy+6x-6y; 8X²-6x+12xy-9y; 2X²-5x+2xy-5y; X²-2x+2xy-14y; X²y+13y-7X²-91; X²-6x+5xy-30y;
20xy+12x-5y-3; 3X²-3x-2xy+2y; 8X²-20xy-15y-6x; 3X²+18x-42y-7xy.

Answer 2

（X-Y)(X+6)
(X方+13)(Y-7)
(X-Y)(Y-X)
（X-Y)(Y-X)
(X方+13)(X-Y)
(X+1)(X-3)
(X-3) (X+6)
(Y方+3)(X方-5）
(X方-5）(X+6)
(X-3)(Y方+3)

Answer 3

X²-2x-3
=(x+1)(x-3)