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计算下列各题(1)3×(-4)+(-28)÷7(2)4×(-3)2-15÷(-3)-50(3)(−14+16−18+112)×(−24)(4)−13−(1−0.5)×13×[2−(−3)2](5)9989×(−13)(6)|213−323|−[(−156)−(−0.5)−|−116|].

题目详情
计算下列各题
(1)3×(-4)+(-28)÷7
(2)4×(-3)2-15÷(-3)-50
(3)(−
1
4
+
1
6
1
8
+
1
12
)×(−24)
(4)13−(1−0.5)×
1
3
×[2−(−3)2]
(5)99
8
9
×(−13)
(6)|2
1
3
−3
2
3
|−[(−1
5
6
)−(−0.5)−|−1
1
6
|].
▼优质解答
答案和解析
(1)3×(-4)+(-28)÷7
=-12-4
=-16;

(2)4×(-3)2-15÷(-3)-50
=4×9+5-50
=36+5-50
=-9;

(3)(−
1
4
+
1
6
1
8
+
1
12
)×(−24)
=6-4+3-2
=9-6
=3;

(4)−13−(1−0.5)×
1
3
×[2−(−3)2]
=-1-
1
2
×
1
3
×[2-9]
=-1-
1
2
×
1
3
×(-7)
=-1+
7
6

=
1
6


(5)99
8
9
×(−13)
=(100-
1
9
)×(-13)
=-1300+1
4
9

=-1298
5
9


(6)|2
1
3
−3
2
3
|−[(−1
5
6
)−(−0.5)−|−1
1
6
|]
=1
1
3
-[-1
5
6
-1
1
6
+0.5]
=1
1
3
-[-3+0.5]
=1
1
3
+2
1
2

=3
5
6