赞 tyzhizunbao 幼苗
共回答了17个问题采纳率：76.5% 举报
(x^2+2x-10)(x^2+2-18)-20
=(x^2+2x-10)(x^2+2x-10-8)-20
=(x^2+2x-10)^2-8(x^2+2x-10)-20
=(x^2+2x-10-10)(x^2+2x-10+2)
=(x^2+2x-20)(x^2+2x-8)
=(x^2+2x-20)(x+4)(x-2)
=(x^2+2x-10)(x^2+2x-10-8)-20
=(x^2+2x-10)^2-8(x^2+2x-10)-20
=(x^2+2x-10-10)(x^2+2x-10+2)
=(x^2+2x-20)(x^2+2x-8)
=(x^2+2x-20)(x+4)(x-2)
1年前
9
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你能帮帮他们吗