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化简-（+2）得（ ）
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教案备课库《八（1）年级数学作业小综合检测》真题及答案
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m+n﹣m﹣n化简得
2m
2n
﹣2m
﹣2n
若a＜1化简得
2﹣2a
﹣2a
2
0
化简︱3-π︱-π得
3
-3
2π-3
3-2π
化简tanx＋cotx·cos2x得
tanx
sinx
cosx (
)cotx
化简2a-11+2a得．
已知则化简得
对于有理数ab定义a⊙b＝3a＋2b则x＋y⊙x－y化简后得________.
化简x
2x
2
y
2xy
4x
2
y
－2x
2
y
化简tanx＋cotx·cos2x得
tanx
sinx
cosx (
)cotx
化简得.
化简得.
化简得
6
2x
6或－2x
－2x或6或2
化简﹣得
6
2x
6或﹣2x
6或2x或﹣2x
把化简得_________.
化简得
100
10
±10
化简最后得_________.
如图化简:-+|b+a-1|得
1
1-2b-2a
2a-2b+1
2a+2b-1
化简|3-π|-π得
3
-3
2π-3
3-2π
当m＜1时化简得
-2m+4
4
-4
2m-6
化简最后得_________.
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