计算:(1)(+18)+(-12)(2)(-1.5)+12-(-35)-0.2(3)(23?14?38)×48(4)23×(?6)?(?7)×(?2
计算:(1)(+18)+(-12)(2)(-1.5)+12-(-35)-0.2(3)(23?14?38)×48(4)23×(?6)?(?7)×(?23)?23×5(5)|...
计算:(1)(+18)+(-12)(2)(-1.5)+12-(-35)-0.2(3)(23?14?38)×48(4)23×(?6)?(?7)×(?23)?23×5(5)|-5-4|-5×(-2)-1÷(-12)(6)-997172×36(用简便方法算)
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天堂月丶焱狀
推荐于2016-01-22
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(1)(+18)+(-12),
=+(18-12),
=6;
(2)(-1.5)+
-(-
)-0.2,
=-1.5+0.5+0.6-0.2,
=-1.7+1.1,
=-0.6;
(3)(
??)×48,
=
×48-
×48-
×48,
=32-12-18,
=32-30,
=2;
(4)
×(?6)?(?7)×(?)?×5,
=-4-
-
,
=-4-8,
=-12;
(5)|-5-4|-5×(-2)-1÷(-
),
=9+10+2,
=21;
(6)-99
×36,
=(-100+
)×36,
=-100×36+
×36,
=-3600+0.5,
=-3599.5.
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