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- 1a+b=-3,a2-b2=6,则a-b=_;若b-c=2,则代数式1/2b2−bc+1/2c2的值是_.
- 2下列物质中,属于纯净物的是( ) A.豆浆 B.酒精 C.食醋 D.牛奶
- 3she was gald ___(hear) that
- 4计算:1.1+3.3+5.5+7.7+9.9+11.11+13.13+15.15+17.17+19.19=_.
- 5For the first time that he could recall,Tom felt some_____(admire)for his stepfather.
- 6利用因式分解计算 98.5²-2×98.5×78.5+78.5²
- 7只问两步
- 8什么蛋白质不在核糖体上合成?
- 9“教学相长”给我们什么样的启示
- 10为什麼纯电感电路电源自感电动势等于电源电动势啊