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b).2*(-4)+7-12*(-2)= -8+7+24= -1+24=23
c).24-4*(-1)+6-2-(-20)=24+4+6-2+20=32+20=52
d).32:(-8)+11-9:3+20= -4+11-3+20=4+20=24
e).-6:(-2):(-1)-(-8):2= -3+4=1
f).90:(-15)+(-7)-(-4)= -6-7+4= -13+4= -9
g).-(-1)*(-8)-12:6+(+9):3= -8-2+3= -10+3= -7
h).4*(-1)*(-2)+24-18-(-6)*(-1)=8+24-18-6=32-18-6=14-6=8