求分解初二年十字相乘法数学试题，要写过程。
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\u2460 x²+7x+10=(x+2)(x+5)
x\u2198 2
x\u2197 5
\u2461 x²-2x-8=(x+2)(x-4)
x\u2198 2
x\u2197 -4
\u2462 y²-7y+12=(y-3)(y-4)
y\u2198 -3
y\u2197 -4
\u2463 x²+7x-18=(x-2)(x+9)
x\u2198 -2
x\u2197 9
\u2464 2[\uff086x²+x\uff09²-1]\uff086x²+x\uff09+5
\u2465 7x²-13x+6=(7x-6)(x-1)
7x\u2198 -6
x \u2197 -1
\u2466 -y²-4y+12=(-y+2)(y+6)
-y\u2198 6
y\u2197 2
\u2467 15x²+7xy-4y²=(5x+4y)(3x-y)
5x\u21984y
3x\u2197-y
\u2468 10\uff08x+2\uff09²-2\uff08x+2\uff09+10=
\u2469 x²-\uff08a+1\uff09x+a=(x-a)(x-1)
x\u2198 -a
x\u2197 -1
11. 2x²-3xy-2y²-13x+14y-2
=(7x-6)(x-1) ╳
x -1
2. ﹣y²-4y+12 y 6
=-(y²+4y-12) ╳
=-(y+6)(y-2) y -2
3. 15x²+7xy-4y² 3x -y
=(3x-y)(5x+4y) ╳
5x 4y
4. x²-（a+1）x+a
=(x-a)(x-1) x -1
╳
x -a
你好， 第一题(7x-6)(x-1)
2. -(y+6)(y-2)
3 . (3x-1)(5x+4)
4. (x-a) (x-1)
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