题目内容

脱式计算,能简算的要简算.
(1)7200÷4÷25
(2)1
1
5
+2.75+8.8+7
1
4
-10
7
15

(3)3.12×2
1
4
+2.4÷1
1
2

(4)6.5÷(1.7-0.9)+1.4÷0.4.

(1)7200÷4÷25,
=7200÷(4×25),
=7200÷100,
=72;

(2)1
1
5
+2.75+8.8+7
1
4
-10
7
15

=(1
1
5
+8.8)+(2.75+7
1
4
)-10
7
15

=10+10-10
7
15

=20-10
7
15

=9
8
15


(3)3.12×2
1
4
+2.4÷1
1
2

=7.02+1.6,
=8.62;

(4)6.5÷(1.7-0.9)+1.4÷0.4,
=6.5÷0.8+1.4÷0.4,
=8.125+3.5,
=11.625.
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