题目内容

计算:
(1)(-12)-(+8)+(-6)-(-5)
(2)(-2)×(-
5
3
)-|-23|-5÷6-(-
1
3

(3)-(a-b)-3(b-2a)
(4)
1
4
(-4x2+2x-8)-(
1
2
x
-1)
(5)(-
1
4
)
2
÷(-
1
2
)
4
×(-1)8-(1
3
8
+2
1
3
-3
3
4
)×24.
(1)(-12)-(+8)+(-6)-(-5)
=-12-8-6+5
=-26+5
=-21;

(2)(-2)×(-
5
3
)-|-23|-5÷6-(-
1
3

=3
1
3
-8-
5
6
+
1
3

=2
5
6
-8
=-5
1
6


(3)-(a-b)-3(b-2a)
=-a+b-3b+6a
=5a-2b;

(4)
1
4
(-4x2+2x-8)-(
1
2
x
-1)
=-x2+
1
2
x-2-
1
2
x
+1
=-x2-1;

(5)(-
1
4
)
2
÷(-
1
2
)
4
×(-1)8-(1
3
8
+2
1
3
-3
3
4
)×24
=
1
16
÷
1
16
×1-1
3
8
×24-2
1
3
×24+3
3
4
×24
=1-33-56+90
=91-89
=2.
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