早教吧 育儿知识 作业答案 考试题库 百科 知识分享

用简便方法计算.(1)3.8+1314+6.2+31114(2)25÷27+35×72(3)(1-213)×26+26÷13×2.

题目详情
用简便方法计算.
(1)3.8+1
3
14
+6.2+3
11
14

(2)
2
5
÷
2
7
+
3
5
×
7
2

(3)(1-
2
13
)×26+26÷13×2.

3
14
+6.2+3
11
14

(2)
2
5
÷
2
7
+
3
5
×
7
2

(3)(1-
2
13
)×26+26÷13×2.
3
14
331414
11
14
11111414
2
5
÷
2
7
+
3
5
×
7
2

(3)(1-
2
13
)×26+26÷13×2.
2
5
2255
2
7
2277
3
5
3355
7
2
7722
2
13
)×26+26÷13×2.
2
13
221313
▼优质解答
答案和解析

(1)3.8+1
3
14
+6.2+3
11
14

=(3.8+6.2)+(1
3
14
+3
11
14
),
=10+5,
=15;

(2)
2
5
÷
2
7
+
3
5
×
7
2

=
2
5
×
7
2
+
3
5
×
7
2

=(
2
5
+
3
5
)×
7
2

=1×
7
2

=
7
2


(3)(1-
2
13
)×26+26÷13×2,
=
11
13
×26+
26
13
×2,
=
26
13
×11+
26
13
×2,
=
26
13
×(11+2),
=
26
13
×13,
=26.
3
14
333141414+6.2+3
11
14
111111141414,
=(3.8+6.2)+(1
3
14
+3
11
14
),
=10+5,
=15;

(2)
2
5
÷
2
7
+
3
5
×
7
2

=
2
5
×
7
2
+
3
5
×
7
2

=(
2
5
+
3
5
)×
7
2

=1×
7
2

=
7
2


(3)(1-
2
13
)×26+26÷13×2,
=
11
13
×26+
26
13
×2,
=
26
13
×11+
26
13
×2,
=
26
13
×(11+2),
=
26
13
×13,
=26.
3
14
333141414+3
11
14
),
=10+5,
=15;

(2)
2
5
÷
2
7
+
3
5
×
7
2

=
2
5
×
7
2
+
3
5
×
7
2

=(
2
5
+
3
5
)×
7
2

=1×
7
2

=
7
2


(3)(1-
2
13
)×26+26÷13×2,
=
11
13
×26+
26
13
×2,
=
26
13
×11+
26
13
×2,
=
26
13
×(11+2),
=
26
13
×13,
=26.
11
14
111111141414),
=10+5,
=15;

(2)
2
5
÷
2
7
+
3
5
×
7
2

=
2
5
×
7
2
+
3
5
×
7
2

=(
2
5
+
3
5
)×
7
2

=1×
7
2

=
7
2


(3)(1-
2
13
)×26+26÷13×2,
=
11
13
×26+
26
13
×2,
=
26
13
×11+
26
13
×2,
=
26
13
×(11+2),
=
26
13
×13,
=26.
2
5
222555÷
2
7
222777+
3
5
333555×
7
2
777222,
=
2
5
×
7
2
+
3
5
×
7
2

=(
2
5
+
3
5
)×
7
2

=1×
7
2

=
7
2


(3)(1-
2
13
)×26+26÷13×2,
=
11
13
×26+
26
13
×2,
=
26
13
×11+
26
13
×2,
=
26
13
×(11+2),
=
26
13
×13,
=26.
2
5
222555×
7
2
+
3
5
×
7
2

=(
2
5
+
3
5
)×
7
2

=1×
7
2

=
7
2


(3)(1-
2
13
)×26+26÷13×2,
=
11
13
×26+
26
13
×2,
=
26
13
×11+
26
13
×2,
=
26
13
×(11+2),
=
26
13
×13,
=26.
7
2
777222+
3
5
×
7
2

=(
2
5
+
3
5
)×
7
2

=1×
7
2

=
7
2


(3)(1-
2
13
)×26+26÷13×2,
=
11
13
×26+
26
13
×2,
=
26
13
×11+
26
13
×2,
=
26
13
×(11+2),
=
26
13
×13,
=26.
3
5
333555×
7
2

=(
2
5
+
3
5
)×
7
2

=1×
7
2

=
7
2


(3)(1-
2
13
)×26+26÷13×2,
=
11
13
×26+
26
13
×2,
=
26
13
×11+
26
13
×2,
=
26
13
×(11+2),
=
26
13
×13,
=26.
7
2
777222,
=(
2
5
+
3
5
)×
7
2

=1×
7
2

=
7
2


(3)(1-
2
13
)×26+26÷13×2,
=
11
13
×26+
26
13
×2,
=
26
13
×11+
26
13
×2,
=
26
13
×(11+2),
=
26
13
×13,
=26.
2
5
222555+
3
5
)×
7
2

=1×
7
2

=
7
2


(3)(1-
2
13
)×26+26÷13×2,
=
11
13
×26+
26
13
×2,
=
26
13
×11+
26
13
×2,
=
26
13
×(11+2),
=
26
13
×13,
=26.
3
5
333555)×
7
2

=1×
7
2

=
7
2


(3)(1-
2
13
)×26+26÷13×2,
=
11
13
×26+
26
13
×2,
=
26
13
×11+
26
13
×2,
=
26
13
×(11+2),
=
26
13
×13,
=26.
7
2
777222,
=1×
7
2

=
7
2


(3)(1-
2
13
)×26+26÷13×2,
=
11
13
×26+
26
13
×2,
=
26
13
×11+
26
13
×2,
=
26
13
×(11+2),
=
26
13
×13,
=26.
7
2
777222,
=
7
2


(3)(1-
2
13
)×26+26÷13×2,
=
11
13
×26+
26
13
×2,
=
26
13
×11+
26
13
×2,
=
26
13
×(11+2),
=
26
13
×13,
=26.
7
2
777222;

(3)(1-
2
13
)×26+26÷13×2,
=
11
13
×26+
26
13
×2,
=
26
13
×11+
26
13
×2,
=
26
13
×(11+2),
=
26
13
×13,
=26.
2
13
222131313)×26+26÷13×2,
=
11
13
×26+
26
13
×2,
=
26
13
×11+
26
13
×2,
=
26
13
×(11+2),
=
26
13
×13,
=26.
11
13
111111131313×26+
26
13
×2,
=
26
13
×11+
26
13
×2,
=
26
13
×(11+2),
=
26
13
×13,
=26.
26
13
262626131313×2,
=
26
13
×11+
26
13
×2,
=
26
13
×(11+2),
=
26
13
×13,
=26.
26
13
262626131313×11+
26
13
×2,
=
26
13
×(11+2),
=
26
13
×13,
=26.
26
13
262626131313×2,
=
26
13
×(11+2),
=
26
13
×13,
=26.
26
13
262626131313×(11+2),
=
26
13
×13,
=26.
26
13
262626131313×13,
=26.