题目内容

脱式计算
17255÷85×49-749
3
3
4
-(0.2+
1
3
)×4.5〕÷(7.05+6
9
20
2.75+3
4
5
+10.2+1
1
4
9.9+2.5×
4
5
-2.7÷2
1
4
6
3
5
÷〔0.5÷
5
8
-
10
13
×(0.4+
1
4
)〕

(1)17255÷85×49-749,
=203×49-749,
=9947-749,
=9198;

(2)〔3
3
4
-(0.2+
1
3
)×4.5〕÷(7.05+6
9
20
),
=【3
3
4
-
8
15
×4.5】÷13.5,
=【3.75-2.4】÷13.5,
=1.35÷13.5,
=0.1;
(3)2.75+3
4
5
+10.2+1
1
4

=(2.75+1.25)+(3.8+10.2),
=4+14,
=18;

(4)9.9+2.5×
4
5
-2.7÷2
1
4

=9.9+2-1.2,
=10.7;

(5)6
3
5
÷〔0.5÷
5
8
-
10
13
×(0.4+
1
4
)〕,
=6
3
5
÷(
4
5
-
10
13
×
13
20
),
=6
3
5
÷
3
10

=22.
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