计算:(1)(712?56+34)×(-12)÷(-6)(2)?14?[1?(1?0.5×13)]×[2?(?3)2](3)-22-(-3)3×(-1
计算:(1)(712?56+34)×(-12)÷(-6)(2)?14?[1?(1?0.5×13)]×[2?(?3)2](3)-22-(-3)3×(-1)4-(-1)5(4...
计算:(1)(712?56+34)×(-12)÷(-6)(2)?14?[1?(1?0.5×13)]×[2?(?3)2](3)-22-(-3)3×(-1)4-(-1)5(4)(?523)×(?34)?523×17?523×(?6).
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校行期1352
2014-12-15
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(1)(
?+)×(-12)÷(-6)
=(
?+)×(-12)×(-
)
=(
?+)×2
=2×
-2×
+2×
=
-
+
=1;
(2)
?14?[1?(1?0.5×)]×[2?(?3)2]=-1-(1-1+0.5×
)×(2-9)
=-1-
×(-7)
=-1+
=
;
(3)-2
2-(-3)
3×(-1)
4-(-1)
5=-4-(-27)×1-(-1)
=-4+27+1
=24;
(4)
(?)×(?34)?×17?×(?6)=
×(34-17+6)
=
×23
=5.
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