题目内容

用递等式计算,能简算的要简算.
①5-5×
2
5
+
3
5
②15.5+5871÷103 ③1.3×20%+7.7×20%
④(
4
5
+
1
4
)×
1
3
+70%
8
9
×[
3
4
-(
7
16
-
1
4
)]
3
8
×
6
7
+
6
7
÷8.
①5-5×
2
5
+
3
5

=5-2+
3
5

=3
3
5


②15.5+5871÷103
=15.5+57,
=72.5;

③1.3×20%+7.7×20%
=(1.3+7.7)×20%,
=9×20%,
=1.8;

④(
4
5
+
1
4
)×
1
3
+70%
=(
16
20
+
5
20
)×
1
3
+70%,
=
21
20
×
1
3
+70%,
=0.35+0.7,
=1.05;

8
9
×[
3
4
-(
7
16
-
1
4
)]
=
8
9
×[
3
4
-
7
16
+
1
4
)],
=
8
9
×[
3
4
+
1
4
-
7
16
],
=
8
9
×[1-
7
16
],
=
8
9
×
9
16

=
1
2


3
8
×
6
7
+
6
7
÷8
=
3
8
×
6
7
+
6
7
×
1
8

=(
3
8
+
1
8
)×
6
7

=
1
2
×
6
7

=
3
7
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