1) 8* (-3)+(-7) = 8*(-3)+(-7) = -24-7 = -31
2) (-2)*(5)-12 = -10-12 = -22
3) 35-(-7)*6 = 35-(-42) = 35+42 = 77
4)32:(-4)+5= -8+5 = -3
5) 64:( - 16 ) = -64:16 = -4
6) 17-(-12):4 = 17-(-3) = 17+3 = 20
7) (-21):(-3)-9 = 7-9 = -2
8) (-42):6+10 = -7+10 = 3
9) 27-(-15):3 = 27-(-5) = 27+5 = 32
10) 4/5:(-2/5) = -4/5:2/5 = -4/5*5/2 = -4*5/5*2 = -20/10 = -2*10/1*10 = -2/1 = -2
1) 8* (-3)+(-7) = 8*(-3)+(-7) = -24-7 = -31
2) (-2)*(5)-12 = -10-12 = -22
3) 35-(-7)*6 = 35-(-42) = 35+42 = 77
4)32:(-4)+5= -8+5 = -3
5) 64:( - 16 ) = -64:16 = -4
6) 17-(-12):4 = 17-(-3) = 17+3 = 20
7) (-21):(-3)-9 = 7-9 = -2
8) (-42):6+10 = -7+10 = 3
9) 27-(-15):3 = 27-(-5) = 27+5 = 32
10) 4/5:(-2/5) = -4/5:2/5 = -4/5*5/2 = -4*5/5*2 = -20/10 = -2*10/1*10 = -2/1 = -2