问题
解答题
计算: (1)(-12)-5+(-14)-(-39); (2)3
(3)(-81)÷2
(4)(
(5)25×
(6)-32÷(-3)2+3×(-2); (7)-16-(
(8)[1
|
答案
(1)原式=-12-5-14+39=8;
(2)原式=(3
-1 2
)+(1 2
+21 3
)=3+3=6;2 3
(3)原式=-81×
-4 9
×(-4 9
)=-36+1 16
=-351 36
;35 36
(4)原式=32-12-18+10=12;
(5)原式=25×(
+3 4
-1 2
)=25;1 4
(6)原式=-9÷9+(-6)=-7;
(7)原式=-1-(-
)×(-1 2
)×(-6)=-1+1=0;1 3
(8)原式=[
-(45 24
+3 8
-1 16
)×(-64)]×3 4 1 5
=[
-(-24-4+48)]×45 24
=(1 5
-20)×45 24
=1 5
-4=-39 24
.15 24