题目内容
计算
(1)﹣8﹣12+2
(2)0.5+
﹣(﹣2.75)+
(3)
÷
(4)
(5)
(1)﹣8﹣12+2
(2)0.5+
(3)
(4)
(5)
解:(1)﹣8﹣12+2
=﹣20+2
=﹣18;
(2)0.5+
﹣(﹣2.75)+(+
)
=0.5+0.25+2.75+0.5
=(0.5+0.5)+(0.25+2.75)
=1+3
=4;
(3)
÷![]()
=﹣9+[(﹣
)×12+(﹣
)×12]
=﹣9+[(﹣8)+(﹣3)]
=﹣9﹣11
=﹣20;
(4)![]()
=﹣9﹣(﹣
﹣
)
=﹣9﹣(﹣
﹣
)
=﹣9﹣(﹣
)
=﹣9+![]()
=﹣8
;
(5)![]()
=(﹣100+
)×14
=﹣100×14+
×14
=﹣1400+4
=﹣1396.
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