解方程.(1)(1+23)x=45(2)27x+45=76(3)(1-15%)x=170

解方程.(1)(1+23)x=45(2)27x+45=76(3)(1-15%)x=170.
2025-06-26 23:49:32
推荐回答(1个)
回答1:

(1)(1+

2
3
)x=45
            
5
3
x=45
          
5
3
x÷
5
3
=45÷
5
3

              x=27;

(2)
2
7
x+
4
5
=76

   
2
7
x+
4
5
-
4
5
=76?
4
5

      
2
7
x÷
2
7
=75
1
5
÷
2
7

           x=263
1
5


(3)(1-15%)x=170
          85%x=170
     85%x÷85%=170÷85%
             x=200.