题目内容
计算题
(1)2×(﹣3);
(2)﹣9+5×(﹣6 )﹣12÷(﹣6 );
(3)|+8|﹣|﹣7|+(﹣1)2004﹣23;
(4)
;
(5)
.
(1)2×(﹣3);
(2)﹣9+5×(﹣6 )﹣12÷(﹣6 );
(3)|+8|﹣|﹣7|+(﹣1)2004﹣23;
(4)
(5)
解:(1)2×(﹣3)=﹣6;
(2)﹣9+5×(﹣6 )﹣12×(﹣6 )
=﹣9﹣30+2
=﹣39+2
=﹣37;
(3)|+8|﹣|﹣7|+(﹣1)2004﹣23
=8﹣7+1﹣8
=0﹣6
=﹣6;
(4)
=(﹣2.5)×
×(﹣6)×(﹣4)
=﹣
×
×6×4
=﹣20;
(5)
=﹣2×
+8+
=﹣
+8+
=8.
(2)﹣9+5×(﹣6 )﹣12×(﹣6 )
=﹣9﹣30+2
=﹣39+2
=﹣37;
(3)|+8|﹣|﹣7|+(﹣1)2004﹣23
=8﹣7+1﹣8
=0﹣6
=﹣6;
(4)
=(﹣2.5)×
=﹣
=﹣20;
(5)
=﹣2×
=﹣
=8.
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