问题 解答题
神机妙算细又巧.
11.3+99×(12.6-1.3)
1
3
÷[
5
6
-(
1
2
-
1
6
)]
(1.25+1.25+1.25+1.25)×2.5÷
1
8

12×(
5
12
+
7
25
)×25.
答案

(1)11.3+99×(12.6-1.3),

=11.3+99×11.3,

=(99+1)×11.3,

=100×11.3,

=1130;

(2)

1
3
÷[
5
6
-(
1
2
-
1
6
)],

=

1
3
÷[
5
6
+
1
6
-
1
2
],

=

1
3
÷[1-
1
2
],

=

1
3
÷
1
2

=

1
3
×2,

=

2
3

(3)(1.25+1.25+1.25+1.25)×2.5÷

1
8

=1.25×4×2.5×8,

=1.25×8×(4×2.5),

=10×10,

=100;

(4)12×(

5
12
+
7
25
)×25,

=12×

5
12
×25+12×
7
25
×25,

=125+84,

=209.

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