一元二次方程x2+5x-6=0的两根和是______.
设x1、x2为一元二次方程x2+5x-6=0的两根,
则由根与系数的关系得:x1+x2=-5.
故填空答案:-5.
()means the conducting of business communication and transaction over network and through computers.
A.E-mail
B.E-Government
C.E-text
D.E-Commerce
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