题目内容

计算下面各题.
5.1÷4+4.9×25%
2
1
5
×0.75+2.2×
1
4

(1
1
2
-37.5%)÷(
1
25
+40%+2.1)
(1)5.1÷4+4.9×25%
=5.1×
1
4
+4.9×
1
4

=(5.1+4.9)×
1
4

=10×
1
4

=2.5;
(2)2
1
5
×0.75+2.2×
1
4

=2.2×0.75+2.2×0.25,
=(0.75+0.25)×2.2,
=1×2.2,
=2.2;
(3)(1
1
2
-37.5%)÷(
1
25
+40%+2.1)
=(
3
2
-
3
8
)÷(
1
25
+
2
5
+
21
10
),
=
9
8
÷
127
50

=
225
508
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