题目内容

脱式计算(能用简便方法的用简便方法计算)
[(
7
16
-
1
4
)+
15
16
1
2

61
3
4
-15.37+38
1
4
-34.63
23-
8
9
×
3
8
÷
1
27

5.8×99-4.2
10.6-(6.3+0.125÷12.5%)
(1)[(
7
16
-
1
4
)+
15
16
1
2

=[
3
16
+
15
16
]÷
1
2

=
18
16
÷
1
2

=2.25;

(2)61
3
4
-15.37+38
1
4
-34.63,
=(61
3
4
+38
1
4
)-(15.37+34.63),
=100-50,
=50;

(3)23-
8
9
×
3
8
÷
1
27

=23-
3
9
÷
1
27

=23-9,
=14;

(4)5.8×99-4.2,
=5.8×(100-1)-4.2,
=580-5.8-4.2,
=580-(5.8+4.2),
=580-10,
=570;

(5)10.6-(6.3+0.125÷12.5%),
=10.6-(6.3+1),
=10.6-7.3,
=3.3.
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