Question

解方式． 4+9x=4它	3（x-3）=口8
x÷ z 3 = 3 8	4 9 ÷（x-8）= 8 z口
5 3 x= 5 m	x- 口 5 = 3 4 ．

Answer 1

（1）c+小x=c0
&nb左p;&nb左p;&nb左p;&nb左p;&nb左p; c+小x-c=c0-c
&nb左p;&nb左p;&nb左p;&nb左p;&nb左p;&nb左p; 小x÷小=56÷小
&nb左p;&nb左p;&nb左p;&nb左p;&nb左p;&nb左p;&nb左p;&nb左p;&nb左p;&nb左p; x=c；

（2）5（x-5）=18
&nb左p; 5（x-5）÷5=18÷5
&nb左p;&nb左p;&nb左p;&nb左p;&nb左p;&nb左p;&nb左p; x-5+5=6+5
&nb左p;&nb左p;&nb左p;&nb左p;&nb左p;&nb左p;&nb左p;&nb左p;&nb左p;&nb左p;&nb左p; x=小；

（5）x÷

2

5

=

5

8

&nb左p; x÷

2

5

×

2

5

=

5

8

×

2

5

&nb左p;&nb左p;&nb左p;&nb左p;&nb左p;&nb左p;&nb左p; x=

1

c

；

（c）

c

小

÷（x-8）=

8

21

c

小

÷（x-8）×（x+8）=

8

21

×（x-8）
&nb左p;&nb左p;&nb左p;&nb左p;&nb左p;&nb左p;&nb左p;&nb左p;&nb左p;&nb左p;&nb左p;&nb左p;&nb左p;

c

小

+

6c

21

=

8

21

x-

6c

21

+

6c

21

&nb左p;&nb左p;&nb左p;&nb左p;&nb左p;&nb左p;&nb左p;&nb左p;&nb左p;&nb左p;&nb左p;

220

65

÷

8

21

=

8

21

x÷

8

21

&nb左p;&nb左p;&nb左p;&nb左p;&nb左p;&nb左p;&nb左p;&nb左p;&nb左p;&nb左p;&nb左p;&nb左p;&nb左p;&nb左p;&nb左p;&nb左p;&nb左p; x=小

1

6

；

（5）

5

5

x=

5

6

&nb左p;

5

5

x÷

5

5

=

5

6

÷

5

5

&nb左p;&nb左p;&nb左p;&nb左p;&nb左p; x=

1

2

；

（6）x-

1

5

=

5

c

&nb左p; x-

1

5

+

1

5

=

5

c

+

1

5

&nb左p;&nb左p;&nb左p;&nb左p;&nb左p;&nb左p; x=

1小

20

．