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计算:(1)(-12)-5+(-14)-(-39);(2)312−(−13)+223+(−12);(3)(-81)÷214-49÷(-16);(4)(23−14−38+524)×48;(5)25×34-(-25)×12+25×(-14);(6)-32÷(-3)2+3×(-2);(7)−16−

题目详情
计算:
(1)(-12)-5+(-14)-(-39);
(2)3
1
2
−(−
1
3
)+2
2
3
+(−
1
2
);
(3)(-81)÷2
1
4
-
4
9
÷(-16);
(4)(
2
3
1
4
3
8
+
5
24
)×48;
(5)25×
3
4
-(-25)×
1
2
+25×(-
1
4
);
(6)-32÷(-3)2+3×(-2);
(7)16−(
1
2
−1)×(−
1
3
)(2−23);
(8)[1
21
24
−(
3
8
+
1
16
3
4
(−4)3]÷5.
▼优质解答
答案和解析
(1)原式=-12-5-14+39=8;
(2)原式=(3
1
2
-
1
2
)+(
1
3
+2
2
3
)=3+3=6;
(3)原式=-81×
4
9
-
4
9
×(-
1
16
)=-36+
1
36
=-35
35
36

(4)原式=32-12-18+10=12;
(5)原式=25×(
3
4
+
1
2
-
1
4
)=25;
(6)原式=-9÷9+(-6)=-7;
(7)原式=-1-(-
1
2
)×(-
1
3
)×(-6)=-1+1=0;
(8)原式=[
45
24
-(
3
8
+
1
16
3
4
)×(-64)]×
1
5

=[
45
24
-(-24-4+48)]×
1
5
=(
45
24
-20)×
1
5
=
9
24
−4=-3
15
24