4÷7和3÷7
3÷8和5÷6
3÷4和5÷6
9÷4和11÷5
①当a<0时,函数y=f(x)有零点;
②若函数y=f(x)有零点,则a<0;
③存在a>0,函数y=f(x)有唯一的零点;
④若函数y=f(x)有唯一的零点,则a≤1.
分解因式:4x3﹣4x2y+xy2=____ .
They got two free tickets to Canada; otherwise, they'd never have been able to ______ to go there.