题目内容
计算:
(1)(-12)-(+8)+(-6)-(-5)
(2)(-2)×(-
)-|-23|-5÷6-(-
)
(3)-(a-b)-3(b-2a)
(4)
(-4x2+2x-8)-(
x-1)
(5)(-
)2÷(-
)4×(-1)8-(1
+2
-3
)×24.
(1)(-12)-(+8)+(-6)-(-5)
(2)(-2)×(-
| 5 |
| 3 |
| 1 |
| 3 |
(3)-(a-b)-3(b-2a)
(4)
| 1 |
| 4 |
| 1 |
| 2 |
(5)(-
| 1 |
| 4 |
| 1 |
| 2 |
| 3 |
| 8 |
| 1 |
| 3 |
| 3 |
| 4 |
(1)(-12)-(+8)+(-6)-(-5)
=-12-8-6+5
=-26+5
=-21;
(2)(-2)×(-
)-|-23|-5÷6-(-
)
=3
-8-
+
=2
-8
=-5
;
(3)-(a-b)-3(b-2a)
=-a+b-3b+6a
=5a-2b;
(4)
(-4x2+2x-8)-(
x-1)
=-x2+
x-2-
x+1
=-x2-1;
(5)(-
)2÷(-
)4×(-1)8-(1
+2
-3
)×24
=
÷
×1-1
×24-2
×24+3
×24
=1-33-56+90
=91-89
=2.
=-12-8-6+5
=-26+5
=-21;
(2)(-2)×(-
| 5 |
| 3 |
| 1 |
| 3 |
=3
| 1 |
| 3 |
| 5 |
| 6 |
| 1 |
| 3 |
=2
| 5 |
| 6 |
=-5
| 1 |
| 6 |
(3)-(a-b)-3(b-2a)
=-a+b-3b+6a
=5a-2b;
(4)
| 1 |
| 4 |
| 1 |
| 2 |
=-x2+
| 1 |
| 2 |
| 1 |
| 2 |
=-x2-1;
(5)(-
| 1 |
| 4 |
| 1 |
| 2 |
| 3 |
| 8 |
| 1 |
| 3 |
| 3 |
| 4 |
=
| 1 |
| 16 |
| 1 |
| 16 |
| 3 |
| 8 |
| 1 |
| 3 |
| 3 |
| 4 |
=1-33-56+90
=91-89
=2.
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