题目内容

写出计算过程并得出结果
(1)138×1
1
4
+23.3×(2-75%)-125%×38+(1+0.25)×28.7

(2)
12
4
5
×3
3
4
-4
4
11
×4
1
8
2
4
7
×11
2
3
(1)138×1
1
4
+23.3×(2-75%)-125%×38+(1+0.25)×28.7,
=138×1.25+23.3×1.25-1.25×38+1.25×28.7,
=(138+23.3-38+28.7)×1.25,
=[(138-38)+(23.3+28.7)]×1.25,
=(100+52)×1.25,
=100×1.25+52×1.25,
=125+13×(4×1.25),
=125+13×5,
=125+65,
=190.

(2)
12
4
5
×3
3
4
-4
4
11
×4
1
8
2
4
7
×11
2
3

=
64
5
×
15
4
-
48
11
×
33
8
18
7
×
35
3

=
48-18
30

=
30
30

=1.
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