把甲数看成9份,乙数就是5份,则:
甲数:乙数=9份:5份=9:5;
故选:B.
已知m,n是方程x2-2x-1=0的两根,且(7m2-14m+a)(3n2-6n-7)=8,则a的值等于( )
A.-5
B.5
C.-9
D.92
—Which of the two T-shirts will you take?
—I’ll take . One is for my brother and the other is for myself.
A. both B. either C. neither