计算: (1)(-9)-(+10)-(+2)-(-8) (2)(-8.4)+1
(3)(-5.3)+(-3.2)-(-2.5)-(+4.8) (4)12+(-3)-(+15)-(-4) (5)-
(6)(+
|
(1)原式=-9-10-2+8=-21+8=-13;
(2)原式=-8.4+1.5-0.3+2.2=-8.7+3.5=-5.2;
(3)原式=-5.3-3.2+2.5-4.8=-13.3+2.5=-10.8;
(4)原式=12-3-15+4=-2;
(5)原式=-
+7 6
=-1 4
;11 12
(6)原式=(
-7 13
)+(17+7)+(27 13
-11 3
)=0+24+1=25.1 3