(本题8分)计算:(1); (2)
(本题共有2小题,每小题4分,共8分)(1)计算:; (2)解方程组:
(1)计算:+2sin30°- (2)计算:
(1)计算:(2)解不等式组:并把解集在数轴上表示出来.
(1)计算:(-2)-1-|-|+(-1)0+cos45°.(2))已知m2-5m-14=0,求(m-1)(2m-1)-(m+1)2+1的值.
(本题7分)先化简,再求值:,其中x=2cos30°+tan45.
(本题20分,每题5分)计算:(1)(2)(3)(4)
(1)2sin60°+--; (2)+(1-a)(1+a).
(1)计算:.(2)先化简,再求值:,其中满足.
(本题满分8分,每题4分)计算:(1)+2sin45°- (2)2(a+1)-(3-a)(3+a)-
(本题10分,每小题5分)(1)计算: ; (2)解方程组:
(1)计算:;(2)解分式方程:.
(本小题满分10分。每题5分)(1)计算:;(2)解方程:
(1)计算: ( - 1 ) 2015 - 9 + ( 3 - π ) 0 + | 3 - 3 | + ( tan 30 ° ) - 1 (2)解方程组: x + y = 6 2 x - y = 9
(本小题满分10分,每小题5分)(1)计算:-∣-5∣+3tan30°-()0(2)解方程:(x-3)2+2(x-3)=0