3x2+2x-3(x2-13x)
=3x2+2x-3x2+x
=3x,
当x=-13时,原式=3×(-13)=-1.
A new technique(),the producity of loading as a whole increased by 20 percent.
A.working out
B.having been worked out
C.having worked out
D.to have been worked out
患者男性,缺失,牙槽嵴丰满,唇侧倒凹较大,拟行可摘局部义齿修复,为基牙
按肯氏分类,该患者应该属于()
A.第一类
B.第二类
C.第三类
D.第四类
E.第五类