解比例.45:4=x:3.5 &nb

解比例.45:4=x:3.5 0.2:169=120:x32:x=0.9:4.2x:625=19:1.8.
2025-02-06 09:51:16
推荐回答(1个)
回答1:

(1)
4
5
:4=x:3.5 
           4x=
4
5
×3.5
        4x÷4=2.8÷4
            x=0.7;

(2)0.2:
16
9
=
1
20
:x
        0.2x=
16
9
×
1
20

   0.2x÷0.2=
4
45
÷0.2
           x=
4
9


(3)
3
2
:x=0.9:4.2
     0.9x=
3
2
×4.2
0.9x÷0.9=6.3÷0.9
        x=7;

(4)x:
6
25
=
1
9
:1.8
      1.8x=
6
25
×
1
9

 1.8x÷1.8=
2
75
÷1.8
         x=
2
135