Question

几道初二数学题,3 4题要过程.

Answer 1

-1,0,1,2B三的根号开到哪？a??+b??=(A+B)??-2AB =(√3 + 2)??-2*√12=3+4+4√3-4√3=7(a-b)??=a??+b??-2AB=7-2*√12=7-4√3