| (1)(-3.6)+(+2.5)=-1.1; (2)3-2×(-5) 2 =3-2×25 =3-50 =-47; (3) -24×(-
=24×
=20-9+2 =13; (4)
=(
=0-1+
=-
(5) - 1 4 -(
=-1-(
=-1-(
=-1-0 =-1; (6)5×(-6)-(-4) 2 ÷(-8) =-30-16÷(-8) =-30+2 =-28; (7)-7.2-0.9-5.6+1.7 =-13.7+1.7 =-12; (8) (-1
=-1.6-3.2+1.8 =-4.8+1.8 =-3. |