细心算一算(1)(+2)-(-6)(2)|-3|×(-34)÷(-14)(3)(12-56-35)×30(4)18-[6-(-2)×(-12)](5)-2123

细心算一算(1)(+2)-(-6)(2)|-3|×(-34)÷(-14)(3)(12-56-35)×30(4)18-[6-(-2)×(-12)](5)-2123

题型:解答题难度:一般来源:不详
细心算一算
(1)(+2)-(-6)
(2)|-3|×(-
3
4
)÷(-
1
4

(3)(
1
2
-
5
6
-
3
5
)×30

(4)18-[6-(-2)×(-
1
2
)]

(5)-21
2
3
+(+3
1
4
)-(-
2
3
)-(+
1
4
)

(6)(
5
9
-
7
6
)×(-18)-16×(
2
9
-
7
18
)
答案
(1)(+2)-(-6)=8;

(2)|-3|×(-
3
4
)÷(-
1
4

=3×
3
4
×4
=9;

(3)(
1
2
-
5
6
-
3
5
)×30

=
1
2
×30-
5
6
×30-
3
5
×30
=15-25-18
=-28;

(4)18-[6-(-2)×(-
1
2
)]

=18-[6-1]
=18-5
=13;

(5)-21
2
3
+(+3
1
4
)-(-
2
3
)-(+
1
4
)

=-21
2
3
+
2
3
+3
1
4
-
1
4

=-21+3
=-18;

(6)(
5
9
-
7
6
)×(-18)-16×(
2
9
-
7
18
)

=-
11
18
×(-18)-16×(-
1
6

=11+2
2
3

=13
2
3
举一反三
(1)计算:(-2)3-13÷(-
1
2

(2)先化简,再求值:(4a2-3a)-(1-4a+4a2),其中a=-2.
题型:解答题难度:一般| 查看答案
(1)-(-3)2×(-1)-8×(-
1
2
)3×|-2-3|

(2)-14-(1-0.5)×
1
3
×[2-(-3)2]
题型:解答题难度:一般| 查看答案
-14-(1-0.5)×
1
3
×[2-(-3)2]
题型:解答题难度:一般| 查看答案
|-
1
3
|+|-
1
2
|+3×|-
1
9
|-4×
1
6
题型:解答题难度:一般| 查看答案
|-12|÷(
1
3
-
1
2
)×6.
题型:解答题难度:一般| 查看答案
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