![](https://cos-cdn.shuashuati.com/pipixue-wap/2020-1230-1107-53/ti_inject-812ce.png)
(1)10 8 ÷(10 5 ÷10 2 ) (2) -( 2 3 x 2 y 3 z ) 2 (3)(x-y) 9 ÷(y-x) 2 ÷(y-x) 4 (4)(x 3 ) 4 -3x 4 -(x 2 ) 4 (5) ( 1 2 ) -1 -4×(-2 ) -2 +(π-3.14 ) 0 -( 1 3 ) -2 (6) (3 1 8 ) 12 ×( 8 25 ) 11 ×(-2 ) 3 (7)(5x-3y)(3y+5x) (8)(-3a 3 ) 2 -a 3 +(-4a) 2 -a 7 +(-5a 3 ) 3 .