9:x=1/3:1/4 4.25x-1.75×2=5.

问题描述:

9:x=
1
3
1
4
4.25x-1.75×2=5.

9:x=

1
3
1
4

    
1
3
x=
1
4
×9,
 
1
3
x×3=
9
4
×3,
       x=
27
4

4.25x-1.75×2=5.
    4.25x-3.5=5,
4.25x-3.5+3.5=5+3.5,
        4.25x=8.5,
  4.25x÷4.25=8.5÷4.25,
            x=2.