问题 解答题
计算:
(1)-3+5.3+7-5.3
(2)(-2)×
3
2
÷(-
3
4
)×4

(3)-16-|-5|+2×(-
1
2
)2

(4)(
1
3
-
1
4
)÷(-
1
12
)+(-3)3÷(-3)

(5)-
1
2
+
1
2
÷[(-1
1
2
)
3
+(-
1
2
)
2
]×|-2.52|-
1
2
答案

(1)-3+5.3+7-5.3

=-8.3+12.3

=4;

(2)(-2)×

3
2
÷(-
3
4
)×4

=2×

3
2
×
4
3
×4

=16;

(3)-16-|-5|+2×(-

1
2
)2

=-1-5+2×

1
4

=-1-5+

1
2

=-5

1
2

(4)(

1
3
-
1
4
)÷(-
1
12
)+(-3)3÷(-3)

=﹙

1
3
-
1
4
﹚×﹙-12﹚+﹙-3﹚2

=-4+3+9

=8;

(5)-

1
2
+
1
2
÷[(-1
1
2
)
3
+(-
1
2
)
2
]×|-2.52|-
1
2

=-

1
2
+
1
2
÷[-
27
8
+
1
4
25
4
-
1
2

=-

1
2
+
1
2
×﹙-
8
25
﹚×
25
4
-
1
2

=-

1
2
-1-
1
2

=-2.

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