题目内容

脱式计算.能简便计算的用简便方法计算.
①1
3
7
×
4
5
+2
4
7
×
4
5
+
4
5
②(
2
7
+
1
5
)×7×5
③12-
2
7
+
1
7
÷
1
5
8
9
×[
3
4
-(
7
16
-
1
4
)].
①1
3
7
×
4
5
+2
4
7
×
4
5
+
4
5

=(1
3
7
+2
4
7
+1)×
4
5

=(4+1)×
4
5

=5×
4
5

=4;

②(
2
7
+
1
5
)×7×5,
=(
2
7
+
1
5
)×(7×5),
=
2
7
×(7×5)+
1
5
×(7×5),
=
2
7
×7×5+
1
5
×5×7,
=2×5+1×7,
=10+7,
=17;

③12-
2
7
+
1
7
÷
1
5

=12-
2
7
+
5
7

=12+(
5
7
-
2
7
),
=12+
3
7

=12
3
7


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
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