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用递等式计算.(怎样简算怎样算)54×52+54×3213÷5+23×15(47+12)×28[1-(37+514)]÷17x:12=3435+74x=2.

题目详情
用递等式计算.(怎样简算怎样算)
5
4
×
5
2
+
5
4
×
3
2
1
3
÷5+
2
3
×
1
5
4
7
+
1
2
)×28
[1-(
3
7
+
5
14
)]÷
1
7
 x:
1
2
=
3
4
3
5
+
7
4
x=2.
▼优质解答
答案和解析
(1)
5
4
×
5
2
+
5
4
×
3
2

=
5
4
×(
5
2
+
3
2

=
5
4
×4
=5;

(2)
1
3
÷5+
2
3
×
1
5

=(
1
3
+
2
3
)×
1
5

=1×
1
5

=
1
5


(3)(
4
7
+
1
2
)×28
=
4
7
×28+
1
2
×28
=16+14
=30;

(4)[1-(
3
7
+
5
14
)]÷
1
7

=[1-
11
14
1
7

=
3
14
÷
1
7

=1
1
2


(5)x:
1
2
=
3
4

       4x=
1
2
×3
    4x÷4=
3
2
÷4
        x=
3
8


(6)
3
5
+
7
4
x=2
 
3
5
+
7
4
x-
3
5
=2-
3
5

   
7
4
x÷
7
4
=
7
5
÷
7
4

        x=
4
5