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计算:(要求写出计算过程)(1)(14−0.1÷2)×513+1÷1112(2)84911×1.375+105519×0.9(3)(2.5×45)÷(14÷0.8)−0.75÷340(4)8−(7.14×13−229÷2.5)+0.•1.

题目详情
计算:(要求写出计算过程)
(1)(
1
4
−0.1÷2)×
5
13
+1÷1
1
12

(2)84
9
11
×1.375+105
5
19
×0.9
(3)(2.5×
4
5
)÷(
1
4
÷0.8)−0.75÷
3
40

(4)8−(7.14×
1
3
−2
2
9
÷2.5)+0.
1
▼优质解答
答案和解析
(1)(
1
4
−0.1÷2)×
5
13
+1÷1
1
12

=(0.25-0.05)×
5
13
+1÷
13
12

=
1
5
×
5
13
+
12
13

=
1
13
+
12
13

=1;

(2)84
9
11
×1.375+105
5
19
×0.9
=
933
11
×
11
8
+
2000
19
×
9
10

=116
5
8
+94
13
19

=(116+94)+(
5
8
+
13
19
),
=210+1
47
152

=211
47
152


(3)(2.5×
4
5
)÷(
1
4
÷0.8)−0.75÷
3
40

=(2.5×0.8)÷(
1
4
×
5
4
)-
3
4
×
40
3

=2×
16
5
-10,
=6
2
5
-10,
=-3
3
5

作业帮用户 2017-10-11