(1)计算:(2)化简:(a+b)2+b(a﹣b)
计算:sin600cos300+
.计算:-2+(π-1)0+tan60°-;
(2-3)+(2+)(2-);
计算: (1)+6-2;
计算. (1)(2) (3)(4)3x-( 2x-4) +(2x-1)