题目内容

计算(能简算要简算)
(1)3
1
2
+0.65÷1.3-30%

(2)(
1
2
+
5
12
×
2
3
7
9

(3)
4
5
÷[1÷(
5
8
-
1
4
)]

(4)
5
6
+0.36×
5
6
+
5
6
×0.64

(5)6除1.5的商,加上4,再乘4,积是多少?
(1)3
1
2
+0.65÷1.3-30%
=3.5+0.5-30%
=4-0.3
=3.7;

(2)(
1
2
+
5
12
×
2
3
7
9

=
7
9
÷
7
9

=1;

(3)
4
5
÷[1÷(
5
8
-
1
4
)]

=
4
5
÷[1÷
3
8
]

=
4
5
÷
8
3

=
3
10


(4)
5
6
+0.36×
5
6
+
5
6
×0.64

=
5
6
×(0.36+1+0.64)

=
5
6
×2

=
5
3


(5)(1.5÷6+4)×4
=(0.25+4)×4
=4.25×4
=17
答:积是17.
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