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The seventh grade, the second volume, Shanghai science edition, basic mathematics training 8.5, expanding the space answer
I. 1. D 2。 D 3。 A 4。 A 5。 C
Second, 6.0 7. 8.9
( 1)(5x+ 10y)(5x- 10y)(2)？ (3)?
10.=(a？ +b？ )(a？ +b？ -8)
=﹣ 16
Answer? +b？ =4
1 1. 1+x+x？ +x？ =0
=﹣ 1
x+x？ +x？ + +
=0
That's right. I'm in grade seven, too. A question mark means that mine is wrong.