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解比例.6x=1073:8=24:x15:3=12:x34:910=x:3522.4x=2312.52.5=x8.

题目详情
解比例.
6
x
=
10
7
3:8=24:x 15:3=12:x
3
4
9
10
=x:
3
5
22.4
x
=
2
3
12.5
2.5
=
x
8
▼优质解答
答案和解析
(1)
6
x
=
10
7

        10x=6×7,
        10x=42,
    10x÷10=42÷10,
          x=4.2;

(2)3:8=24:x,
       3x=8×24,
       3x=192,
    3x÷3=192÷3,
        x=64;

(3)15:3=12:x,
       15x=3×12,
       15x=36,
   15x÷15=36÷15,
         x=2.4;

(4)
3
4
9
10
=x:
3
5

       
9
10
x=
3
4
×
3
5

       
9
10
x=
9
20

   
9
10
x ÷
9
10
=
9
20
÷
9
10

           x=
1
2


(5)
22.4
x
=
2
3

         2x=22.4×3,
         2x=67.2,
      2x÷2=67.2÷2,
          x=33.6;

(6)
12.5
2.5
=
x
8

       2.5x=12.5×8,
       2.5x=100,
  2.5x÷2.5=100÷2.5,
          x=40.