— Would you like __________?
A:to try it on
B:to try them on
C:trying them on
D:try it on
下列各组(每组两个)三角形中,不相似的是( )
213 =____÷____ 1415 =____÷____
913 =____÷____ 415 =____÷____
对任意实数x、y,定义运算x*y=ax+by+cxy,其中a、b、c为常实数,等号右边的运算是通常意义的加、乘运算.现已知1*2=3,2*3=4,且有一个非零实数m,使得对任意实数x,都有x*m=2x,则m=____