(1)原式=-23+(58+5)=-23+63=40;(2)原式=- 6 5 ×4×(- 5 8 )=3;(3)原式=-8× 9 4 × 4 9 =-8;(4)原式=-15+6+5=-4;(5)原式=9+4-18=-5;(6)原式=-1- 1 2 × 1 3 ×(-7)=-1+ 7 6 = 1 6 .