题目内容

计算题
18.4-2.7+1.6-0.3
4
7
+
4
21
-
1
3
)×42
1
6
-
3
8
÷
7
4
×
7
12
4.28×7.75+0.428×22.5
1
6
+
7
15
)÷
2
5
+
5
12
3.6÷[0.6×(0.8+0.7)].
(1)18.4-2.7+1.6-0.3,
=(18.4+1.6)-(2.7+0.3),
=20-3,
=17;

(2)4.28×7.75+0.428×22.5,
=0.428×77.5+0.428×22.5,
=0.428×(77.5+22.5),
=0.428×100,
=42.8;

(3)(
4
7
+
4
21
-
1
3
)×42,
=
4
7
×42+
4
21
×42-
1
3
×42,
=24+8-14,
=18;

(4)(
1
6
+
7
15
)÷
2
5
+
5
12

=
19
30
×
5
2
+
5
12

=
19
12
+
5
12

=2;

(5)
1
6
-
3
8
÷
7
4
×
7
12

=
1
6
-
3
8
×
4
7
×
7
12

=
1
6
-
1
8

=
1
24


(6)3.6÷[0.6×(0.8+0.7)],
=3.6÷[0.6×1.5],
=3.6÷0.9,
=4.
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