题目内容

脱式计算.(写出主要过程,能简算的要简算)
(1)9
1
4
×9.8+9.25×
1
5

(2)
7
13
-0.4+
6
13
-
3
5

(3)1500÷(25.2×2-1.6)
(4)1.2×
3
4
-
2
5
×1.25
(5)1÷0.1+
5
9
÷
10
27
-
3
5

(1)9
1
4
×9.8+9.25×
1
5

=9.25×9.8+9.25×0.2,
=9.25×(9.8+0.2),
=9.25×10,
=92.5;

(2)
7
13
-0.4+
6
13
-
3
5

=(
7
13
+
6
13
)-(0.4+
3
5
),
=1-1,
=0;

(3)1500÷(25.2×2-1.6),
=1500÷(50.4-1.6),
=1500÷48.8,
=30
45
61


(4)1.2×
3
4
-
2
5
×1.25,
=0.9-0.5,
=0.4;

(5)1÷0.1+
5
9
÷
10
27
-
3
5

=10+1.5-0.6,
=11.5-0.6,
=10.9.
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