题目内容

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.
(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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