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(1)计算:|3%1|+2%2%2sin60°+(π 10)0.(2)先化简,再求值:(x+1%...

(1)原式= 3 -1+ 1 4 -2* 3 2 +1= 1 4 ;(2)原式=( x 2 -1 x-1 - 15 x-1 )÷ x-4 x-1 ,= x 2 -16 x-1 - x-1 x-4 ,= (x-4)(x+4) x-1 - x-1 x-4 ,=x+4.当x=5 2 -4时,原式=5 2 -4+4=5 2 .

(1)原式=2- 3 -1 2 +2* 3 2 -1=1 2 ;(2)原式=x+1?1 x+1 ?(x+1)(x?1) x =x-1,把x=-2代入得,原式=-2-1=-3.

sin(2乘3.14_a).sin(3.14+a).cos(_3.14+a ) /sin(3乘3.14_a).cos(3.14+a) =-sina*(-sina)*cosa/sina *(-cosa) =-sina

(1)原式=1-4-2* 3 2 + 3 -1=-4;(2)原式= x (x?1)2 ? (x+1)(x?1) x(x+1) = 1 x?1 ,当x= 2 +1时,原式= 1 2 +1?1 = 2 2 .

(1)原式=2-3-1-232+313=-6;(2)原式=(a+2a(a2)+8(a2)(a+2))*aa2=(a+2)28a(a2)2(a+2)=1a+2.在-3

(1)原式= 3 - 3 *( 3 2 +1)+1= 3 - 3 2 - 3 +1=- 1 2 ;(2)原式= 2a (a+2b)(a?2b) - a+2b (a+2b)(a?2b) = 2a?(a+2b) (a?2b)(a+2b) = a?2b (a?2b)(a+2b) = 1 a+2b ,当a=3,b=-2时,原式= 1 3+2*(?2) =-1.

(1)原式=1-4+2* 3 2 + 3 -1=2 3 -4;(2)原式= (x+1)(x?1) x+1 ? x(x?1) (x?1)2 =x.

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