A:(c)(f)(i)(j)
B:(c)(f)(i)(j)(l)
C:(c)(h)(i)(j)
D:(c)(i)(j)(l)
已知数列1,11+2,11+2+3,⋯11+2+3+⋯+n,⋯,则其前n项的和等于____
计算:0.365×640+312×36.5+365×0.01.
全国性抗日战争开始于( )