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计算:(1)-13×(−3)+(−15)×5(2)(23−1112−1415)×(−60)(3)−134−(−18)+338+(−214)(4)−42÷(−12)÷(−1)7+(118+113−34)×24.

题目详情
计算:
(1)-
1
3
×(−3)+(−
1
5
)×5
(2)(
2
3
11
12
14
15
)×(−60)
(3)−1
3
4
−(−
1
8
)+3
3
8
+(−2
1
4
)
(4)42÷(−
1
2
)÷(−1)7+(1
1
8
+1
1
3
3
4
)×24.
▼优质解答
答案和解析
(1)-
1
3
×(−3)+(−
1
5
)×5
=1-1
=0;

(2)(
2
3
11
12
14
15
)×(−60)
=-
2
3
×60+
11
12
×60+
14
15
×60
=-40+55+56
=71;

(3)−1
3
4
−(−
1
8
)+3
3
8
+(−2
1
4
)
=(-1
3
4
-2
1
4
)+(
1
8
+3
3
8

=-4+3
1
2

=-
1
2


(4)−42÷(−
1
2
)÷(−1)7+(1
1
8
+1
1
3
3
4
)×24
=-16×2÷1+(27+32-18)
=-32+41
=9.