问题 解答题
计算:
(1)-12+13-(9-18)
(2)5
1
5
-[2
1
6
+(-4.8)-(-4
5
6
)
]
(3)5+3×(-2)3+33
(4)30÷(
1
5
-
1
6
答案

(1)-12+13-(9-18)

=-12+13-(-9)

=-12+13+9

=-12+22

=10;

(2)5

1
5
-[2
1
6
+(-4.8)-(-4
5
6
)]

=5

1
5
-(2
1
6
-4.8+4
5
6

=5

1
5
-7+4.8

=10-7

=3;

(3)5+3×(-2)3+33

=5+3×(-8)+27

=5-24+27

=32-24

=8;

(4)30÷(

1
5
-
1
6

=30÷

1
30

=30×30

=900.

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