1.-2/5
3.3
4.|a|=-a
5.-7/3xy
6.6a+3
7.-3
8.20x+15y
10.n*(n+2)=n^2+2*n
妈妈要检查,10题左右的填空题,会有些模糊
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1.-2/5
3.3
4.|a|=-a
5.-7/3xy
6.6a+3
7.-3
8.20x+15y
10.n*(n+2)=n^2+2*n