计算题18.4-2.7+1.6-0.3(47+421-13)×4216-38÷74×7124.28×7.75+0.428×22.5(16+715)÷25+5123.6÷[0.6×(0.8+0.7)].-数学

题文

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)].
题型:解答题  难度:中档

答案

(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

=
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