计算题:(1)23-17-(-7)+(-16)(2)?5+6÷(?2)×13;(3)(?5)×(?879)?(?7)×(+799)+12÷(?979);(4)?1
计算题:(1)23-17-(-7)+(-16)(2)?5+6÷(?2)×13;(3)(?5)×(?879)?(?7)×(+799)+12÷(?979);(4)?14÷(?...
计算题:(1)23-17-(-7)+(-16)(2)?5+6÷(?2)×13;(3)(?5)×(?879)?(?7)×(+799)+12÷(?979);(4)?14÷(?5)2×(?53)+|0.8?1|.
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蚯蚓不悔I40
推荐于2016-08-17
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(1)23-17-(-7)+(-16),
=23-17+7-16,
=23+7-17-16,
=30-33,
=-3;
(2)?5+6÷(?2)×,
=-5-3×
,
=-5-1,
=-6;
(3)(?5)×(?8)?(?7)×(+)+12÷(?),
=5×
+×7-12×
,
=(5+7-12)×
,
=0;
(4)?14÷(?5)2×(?)+|0.8?1|,
=1×
×
+1-0.8,
=1-0.8+0.024,
=0.224.
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