题目内容
计算:(1)﹣4﹣28﹣(﹣19)+(﹣24)+|﹣5﹣21|;
(2)
(3)
(2)
(3)
解:(1)﹣4﹣28﹣(﹣19)+(﹣24)+|﹣5﹣21|
=﹣4﹣28+19﹣24+26
=﹣4﹣28﹣24+19+26
=﹣56+45
=﹣11;
(2)
=﹣(
×60
)
=﹣(40﹣5﹣4)
=﹣31;
(3)
=
﹣(0.2﹣0.8)×
×
=
+
×
×
=
﹣
=
﹣
=
.
=﹣4﹣28+19﹣24+26
=﹣4﹣28﹣24+19+26
=﹣56+45
=﹣11;
(2)
=﹣(
=﹣(40﹣5﹣4)
=﹣31;
(3)
=
=
=
=
=
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