问题 解答题
用你喜欢的方法计算.
1
12
-
1
51
)×12×17
3.3×
4
7
+8×
4
7
+2.7÷1
3
4
8
17
×0.8+
4
5
+
9
17
×80%
1-[1-(
3
4
-
3
4
÷
6
5
)]×
7
8
答案

(1)(

1
12
-
1
51
)×12×17,

=(

1
12
-
1
51
)×(12×17),

=(

1
12
×12×17)-(
1
51
×17×12),

=(1×17)-(

1
3
×12),

=17-4,

=13;

(2)3.3×

4
7
+8×
4
7
+2.7÷1
3
4

=3.3×

4
7
+8×
4
7
+2.7×
4
7

=(3.3+8+2.7)×

4
7

=14×

4
7

=8;

(3)

8
17
×0.8+
4
5
+
9
17
×80%,

=(

8
17
+1+
9
17
)×0.8,

=2×0.8,

=1.6;

(4)1-[1-(

3
4
-
3
4
÷
6
5
)]×
7
8

=1-[1-(

3
4
-
5
8
)]×
7
8

=1-[1-

1
8
7
8

=1-

7
8
×
7
8

=1-

49
64

=

15
64

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