题目内容

怎样算简便就怎样算:
6.4×
2
5
+6
2
5
×(1-40%);
5
12
+(
5
6
-
1
12
)÷
9
16

14
15
×
2
9
×15×9;
2
7
×
5
9
+
4
7
×
2
9
(1)6.4×
2
5
+6
2
5
×(1-40%)
=6.4×0.4+6.4×0.6,
=6.4×(0.4+0.6),
=6.4×1,
=6.4;

(2)
5
12
+(
5
6
-
1
12
)÷
9
16

=
5
12
+(
10
12
-
1
12
)×
16
9

=
5
12
+
9
12
×
16
9

=
5
12
+
16
12

=
7
4


(3)
14
15
×
2
9
×15×9
=(
14
15
×
15)×(
2
9
×9),
=14×2,
=28;

(4)
2
7
×
5
9
+
4
7
×
2
9

=
10
63
+
8
63

=
2
7
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