已知2a=5,2b=3,求2a+b+3的值.
计算:(1)(+45)+(-92)+5+(-8) (2)(3)÷(4)+︱6-10︱-
计算:(2+1)(22+1)(24+1)=(2-1)(2+1)(22+1)(24+1)=(22-1)(22+1)(24+1)=(24-1)(24+1)=(28-1).根据上式的计算方法,请计算(3+1)(32+1)(34+1)…(332+1)-的值.
计算(1) (2)
计算:.
(本题6分)计算: