①x方-2x+2y-y方 ②x方+3x-40 ③2x方-7x+6 ④2x方-7xy+6y ⑤a方-b方+4a+2b+3 ⑥x方+2x-3 ⑦-y方+20y+96 ⑧2x方+x-3
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①x方-2x+2y-y方②x方+3x-40③2x方-7x+6④2x方-7xy+6y⑤a方-b方+4a+2b+3⑥x方+2x-3⑦-y方+20y+96⑧2x方+x-3①x方-2x+2y-y方②x方+3x
①x方-2x+2y-y方 ②x方+3x-40 ③2x方-7x+6 ④2x方-7xy+6y ⑤a方-b方+4a+2b+3 ⑥x方+2x-3 ⑦-y方+20y+96 ⑧2x方+x-3
①x方-2x+2y-y方 ②x方+3x-40 ③2x方-7x+6 ④2x方-7xy+6y ⑤a方-b方+4a+2b+3 ⑥x方+2x-3 ⑦-y方+20y+96 ⑧2x方+x-3
①x方-2x+2y-y方 ②x方+3x-40 ③2x方-7x+6 ④2x方-7xy+6y ⑤a方-b方+4a+2b+3 ⑥x方+2x-3 ⑦-y方+20y+96 ⑧2x方+x-3
1.
第一个参考了下他们的,好像是(x-1)方-(y-1)方
①x²-2x+2y-y²=(x²-2x+1)-(y²-2y+1)=(x-1)²-(y-1)²
②x²+3x-40=(x+8)(x-5)
③2x²-7x+6=(x-2)(2x-3)
④2x²-7xy+6y=x(2x-y)-6y(x-1)(这题题目好像有问题哦)
⑤a²...
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①x²-2x+2y-y²=(x²-2x+1)-(y²-2y+1)=(x-1)²-(y-1)²
②x²+3x-40=(x+8)(x-5)
③2x²-7x+6=(x-2)(2x-3)
④2x²-7xy+6y=x(2x-y)-6y(x-1)(这题题目好像有问题哦)
⑤a²-b²+4a+2b+3=(a²+4a+4)-(b²-2b+1)=(a+2)²-(b-1)²
⑥x²+2x-3=(x+1)(x-3)
⑦-y²+20y+96=-(y+4)(y-24)
⑧2x²+x-3=(x-1)(x+3)
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