题目内容
计算:(1)(
﹣
﹣
)×(﹣60)
(2)(﹣1)2008+(﹣3)2×|﹣
|﹣(﹣4)3÷(﹣2)5
(3)(5x2y﹣7xy2)﹣(xy2﹣3x2y)
(4)3(﹣3a2﹣2a)﹣[a2﹣2(5a﹣4a2+1)﹣3a]
(2)(﹣1)2008+(﹣3)2×|﹣
(3)(5x2y﹣7xy2)﹣(xy2﹣3x2y)
(4)3(﹣3a2﹣2a)﹣[a2﹣2(5a﹣4a2+1)﹣3a]
解:原式=
×(﹣60)﹣
×(﹣60)﹣
×(﹣60)
=﹣40﹣﹣5﹣(﹣4)
=﹣40+5+4
=﹣31;
(2)解:原式=1+9×
﹣(﹣64)÷(﹣32)
=1+
﹣2
=
;
(3)解:原式=5x2y﹣7xy2﹣xy2﹣3x2y
=8x2y﹣8xy2;
(4)解:原式=﹣9a2﹣6a﹣(a2﹣10a+8a2﹣2﹣3a)
=﹣9a2﹣6a﹣(9a2﹣13a﹣2)
=﹣9a2﹣6a﹣9a2+13a+2
=﹣18a2+7a+2.
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