题目内容
算一算:
(1)20+(-12)-(-18)
(2)23×10+(-2)×(-5)2
(3)
÷(-
)-(
)×(-5)
(4)(-
-
+
)÷
(5)|-
|÷(
-0.2)-
×(-4)2
(6)-12008-[0.1252008×(-8)2009+(-12)÷6]2×(-
)+|-2|3.
(1)20+(-12)-(-18)
(2)23×10+(-2)×(-5)2
(3)
| 8 |
| 3 |
| 8 |
| 9 |
| 2 |
| 5 |
(4)(-
| 3 |
| 4 |
| 5 |
| 9 |
| 7 |
| 12 |
| 1 |
| 36 |
(5)|-
| 7 |
| 9 |
| 2 |
| 3 |
| 1 |
| 3 |
(6)-12008-[0.1252008×(-8)2009+(-12)÷6]2×(-
| 1 |
| 5 |
(1)原式=20-12+18=38-12=26.
(2)原式=8×10-2×25=80-50=30.
(3)原式=
×(-
)-
×(-5)=-3+2=-1.
(4)原式=-
×36-
×36+
×36=-27-20+21=-26.
(5)原式=
÷(
-
)-
×16
=
÷
-
=
×
-
=
-
=-
(6)原式=-1-[(
)2008×(-8)2008×(-8)-2]2×(-
)+23
=-1-[(-
×8)2008×(-8)-2]2×(-
)+23
=-1-(-8-2)2×(-
)+23=-1-100×(-
)+23
=-1+20+8
=27.
(2)原式=8×10-2×25=80-50=30.
(3)原式=
| 8 |
| 3 |
| 9 |
| 8 |
| 2 |
| 5 |
(4)原式=-
| 3 |
| 4 |
| 5 |
| 9 |
| 7 |
| 12 |
(5)原式=
| 7 |
| 9 |
| 2 |
| 3 |
| 1 |
| 5 |
| 1 |
| 3 |
=
| 7 |
| 9 |
| 7 |
| 15 |
| 16 |
| 3 |
=
| 7 |
| 9 |
| 15 |
| 7 |
| 16 |
| 3 |
=
| 5 |
| 3 |
| 16 |
| 3 |
=-
| 11 |
| 3 |
(6)原式=-1-[(
| 1 |
| 8 |
| 1 |
| 5 |
=-1-[(-
| 1 |
| 8 |
| 1 |
| 5 |
=-1-(-8-2)2×(-
| 1 |
| 5 |
| 1 |
| 5 |
=-1+20+8
=27.
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