求未知数x.(1)16x+15x?12=5(2)0.5:4=x:4.8.

求未知数x.(1)16x+15x?12=5(2)0.5:4=x:4.8.
2025-06-26 19:17:00
推荐回答(1个)
回答1:

(1)

1
6
x+
1
5
x?
1
2
=5,
          
11
30
x?
1
2
= 5

      
11
30
x?
1
2
+
1
2
=5+
1
2

         
11
30
30
11
11
2
×
30
11

                   x=15;
(2)0.5:4=x:4.8,
         4x=0.5×4.8,
      4x÷4=2.4÷4,
          x=0.6.