题目内容

脱式计算,能简算的要简算.
2
3
+(
5
6
-
3
4
)÷
3
8
②32×40+450÷18
9
20
÷
1
2
×(
2
5
+
4
5
3
4
×
3
4
+
1
4
×0.75-75%
⑤3.6-2.8+3.4-7.2.
2
3
+(
5
6
-
3
4
)÷
3
8

=
2
3
+
1
12
÷
3
8

=
2
3
+
2
9

=
8
9


②32×40+450÷18,
=1280+25,
=1305;

9
20
÷
1
2
×(
2
5
+
4
5
),
=
9
20
÷
1
2
×
6
5

=
9
10
×
6
5

=
27
25


3
4
×
3
4
+
1
4
×0.75-75%,
=
3
4
×0.75+
1
4
×0.75-0.75,
=(
3
4
+
1
4
-1)×0.75,
=0×0.75,
=0;

⑤3.6-2.8+3.4-7.2,
=(3.6+3.4)-(2.8+7.2),
=7-10,
=-3.
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