题目内容
计算:
(1)
.
(2)
.
(3)
.
(4)
.
(1)
(2)
(3)
(4)
解:(1)
=
=[(﹣
)+(﹣5
)]+(3
+2
)
=(﹣6)+6
=0;
(2)(﹣6)÷(﹣0.25)×
=(﹣6)×(﹣4)×
=24×
=11;
(3)﹣2+(1﹣0.2÷
)×(﹣3)
=﹣2+(1﹣
×
)×(﹣3)
=﹣2+
×(﹣3)
=﹣2+(﹣2)
=﹣4;
(4)﹣14﹣
×[2﹣(﹣3)2]
=﹣1﹣
×[2+(﹣9)]
=﹣1﹣
×(﹣7)
=﹣1+
=
.
=
=[(﹣
=(﹣6)+6
=0;
(2)(﹣6)÷(﹣0.25)×
=(﹣6)×(﹣4)×
=24×
=11;
(3)﹣2+(1﹣0.2÷
=﹣2+(1﹣
=﹣2+
=﹣2+(﹣2)
=﹣4;
(4)﹣14﹣
=﹣1﹣
=﹣1﹣
=﹣1+
=
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