因式分解（x2+7y2+10）（x2+9x+18）-28
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（x²+7x+10）（x²+9x+18）-28
=(x+2)(x+5)(x+3)(x+6)-28
=(x+2)(x+6)(x+5)(x+3)-28
=(x²+8x+12)(x²+8+15)-28
=(x²+8x+13.5-1.5)(x²+8+13.5+1.5)-28
=(x²+8x+13.5)²-2.25-28
=(x²+8x+13.5)²-30.25
=(x²+8x+13.5)²-5.5²
=(x²+8x+13.5+5.5)(x²+8x+13.5-5.5)
=(x²+8x+19)(x²+8x+8)
=(x+2)(x+5)(x+3)(x+6)-28
=(x+2)(x+6)(x+5)(x+3)-28
=(x²+8x+12)(x²+8+15)-28
=(x²+8x+13.5-1.5)(x²+8+13.5+1.5)-28
=(x²+8x+13.5)²-2.25-28
=(x²+8x+13.5)²-30.25
=(x²+8x+13.5)²-5.5²
=(x²+8x+13.5+5.5)(x²+8x+13.5-5.5)
=(x²+8x+19)(x²+8x+8)
追问
那个不是7x 是7y2额
追答
盗版教辅上的题，不会是7y²，一定是7x
盗版教辅害死人
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