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- 1用时而……时而……时而……时而造句
- 2设数列{an}的前n项和为Sn,其中an不等于0.a1为常数,且-a1,Sn,a(n+1)成等差数列
- 3在三角形ABC中,sinC=根号2/2,(c-b)sin^2A+bsin^2B=cSin^2C,求三个角的度数.
- 4实验小学六年级有男生460名,女生人数比男生多15%,女生有多少人?
- 5“What did the people think of the new play?” “They got very _____.”
- 6流过同一条导线的电流越大,是不是电子越快,移动的电子量不变?导线通时电子移动速度一直增大吗?
- 7已知ABC为△ABC的三边,且满足a的平方c的平方-b的平方c的平方=a的4次方-b的4次方 试判断三角形ABC的形状
- 8某元素R的相对原子质量是32,在它形成的氧化物中含有氧元素60%,则该氧化物的化学式为____
- 9Today, China is__ a more and more important part in the international affairs
- 10the writer has been used to sl( )in the daytime and working at night