答案
解:(1)3-15=-12;
(2)(-13)-(-8)=-13+8=-5;
(3)12+(-7)-(-8)-15=12-7+8-15=-2;
(4)(-17)+23+(-53)-(-36)=-17+23-53+36=-70+59=-11;
(5)39-15+16-25-(+25)=39-15+16-25-25=55-65=-10;
(6)(-1.4)-(+
2)-(-
1)+(-3.2)=(-1
+1
)-(2
+3
)=-5
;
(7)(-1.75)-(-4)-(+
2)-
=4-(1
+2
)-
=-
;
(8)-3-|-1|-(-3)-(0
-3)=-3-1+3+3
=2
.
解:(1)3-15=-12;
(2)(-13)-(-8)=-13+8=-5;
(3)12+(-7)-(-8)-15=12-7+8-15=-2;
(4)(-17)+23+(-53)-(-36)=-17+23-53+36=-70+59=-11;
(5)39-15+16-25-(+25)=39-15+16-25-25=55-65=-10;
(6)(-1.4)-(+
2)-(-
1)+(-3.2)=(-1
+1
)-(2
+3
)=-5
;
(7)(-1.75)-(-4)-(+
2)-
=4-(1
+2
)-
=-
;
(8)-3-|-1|-(-3)-(0
-3)=-3-1+3+3
=2
.