(3)-3-4+ 19- 1 1; (4)-8+ 12- 16-23.
2. Calculation:
( 1)-4.2+5.7-8.4+ 10; (2)6. 1-3.7-4.9+ 1.8;
3. Calculation:
( 1)(-36)-(-25)-(+36)+(+72); (2)(-8)-(-3)+(+5)-(+9);
(3) ; (4)-9+(-3 )+3 ;
[-|98|+76+(-87)]*23[56+(-75)-(7)]-(8+4+3)
5+2 1*8/2-6-59
68/2 1-8- 1 1*8+6 1
-2/9-7/9-56
4.6-(-3/4+ 1.6-4-3/4)
1/2+3+5/6-7/ 12
[2/3-4- 1/4*(-0.4)]/ 1/3+2
22+(-4)+(-2)+4*3
-2*8-8* 1/2+8/ 1/8
(2/3+ 1/2)/(- 1/ 12)*(- 12)
(-28)/(-6+4)+(- 1)
2/(-2)+0/7-(-8)*(-2)
( 1/4-5/6+ 1/3+2/3)/ 1/2