计算下列各题(1)3×(-4)+(-28)÷7(2)4×(-3)2-15÷(-3)-50(3)(?14+16?18+112)×(?24)(4)
计算下列各题(1)3×(-4)+(-28)÷7(2)4×(-3)2-15÷(-3)-50(3)(?14+16?18+112)×(?24)(4)?13?(1?0.5)×13...
计算下列各题(1)3×(-4)+(-28)÷7(2)4×(-3)2-15÷(-3)-50(3)(?14+16?18+112)×(?24)(4)?13?(1?0.5)×13×[2?(?3)2](5)9989×(?13)(6)|213?323|?[(?156)?(?0.5)?|?116|].
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2015-01-31
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(1)3×(-4)+(-28)÷7
=-12-4
=-16;
(2)4×(-3)
2-15÷(-3)-50
=4×9+5-50
=36+5-50
=-9;
(3)
(?+?+)×(?24)=6-4+3-2
=9-6
=3;
(4)
?13?(1?0.5)××[2?(?3)2]=-1-
×
×[2-9]
=-1-
×
×(-7)
=-1+
=
;
(5)
99×(?13)=(100-
)×(-13)
=-1300+1
=-1298
;
(6)
|2?3|?[(?1)?(?0.5)?|?1|]=1
-[-1
-1
+0.5]
=1
-[-3+0.5]
=1
+2
=3
.
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