题目内容

用科学合理方法计算.
2
5
×
1
5
+40%×
4
5

②360×
2
5
÷(1-40%)
6
7
×8×
14
3
×12.5%
2
5
×
1
5
+40%×
4
5

=
2
5
×(
1
5
+
4
5
),
=
2
5
×1,
=
2
5


②360×
2
5
÷(1-40%),
=360×
2
5
÷0.6,
=144÷0.6,
=240;

6
7
×8×
14
3
×12.5%,
=(
6
7
×
14
3
)×(8×12.5%),
=4×1,
=4.
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