计算:(1)-9+12-3+8(2)(+32)?512?52+(?712)(3)(12+56?712)×(?24)(4)?12?16×[3?(?3)2](5)(5a
计算:(1)-9+12-3+8(2)(+32)?512?52+(?712)(3)(12+56?712)×(?24)(4)?12?16×[3?(?3)2](5)(5a-3b...
计算:(1)-9+12-3+8(2)(+32)?512?52+(?712)(3)(12+56?712)×(?24)(4)?12?16×[3?(?3)2](5)(5a-3b)-3(a-2b)(6)(-2)3÷8-2×(-3)-(-1)2012.
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推荐于2016-11-06
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(1)-9+12-3+8
=-12+20
=8;
(2)
(+)??+(?)=(
-
)-(
+
)
=-1-1
=-2;
(3)
(+?)×(?24)=-
×24-
×24+
×24
=-12-20+14
=-18;
(4)
?12?×[3?(?3)2]=-1-
×[3-9]
=-1-
×[-6]
=1+1
=2;
(5)(5a-3b)-3(a-2b)
=5a-3b-3a+6b
=2a+3b;
(6)(-2)
3÷8-2×(-3)-(-1)
2012.
=-8÷8+6-1
=-1+6-1
=4.
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