计算:(1)-3-(-4)+7 (2)(+14)+(?213)?(?234)?(+323) ...
计算:(1)-3-(-4)+7(2)(+14)+(?213)?(?234)?(+323)(3)(12+56?712)×(?36)(4)(?13)2÷133?12×(23?...
计算:(1)-3-(-4)+7 (2)(+14)+(?213)?(?234)?(+323) (3)(12+56?712)×(?36)(4)(?13)2÷133?12×(23?16)(5)?14?16×[?3+(?3)2].
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栏丝48
2014-11-18
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(1)-3-(-4)+7
=-3+4+7
=-3+11
=8;
(2)
(+)+(?2)?(?2)?(+3)=
-2
+2
-3
=(
+2
)-(2
+3
)
=3-6
=3+(-6)
=-(6-3)
=-3;
(3)
(+?)×(?36)=
×(-36)+
×(-36)-
×(-36)
=-18+(-30)+21
=-48+21
=-(48-21)
=-27;
(4)
(?)2÷?12×(?)=
÷
-12×
+12×
=
×27-8+2
=3-8+2
=-3;
(5)
?14?×[?3+(?3)2]=-1-
×(-3+9)
=-1-
×6
=-1-1
=-2.
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