解比例和方程. 75:x=25:15 24%x+8%x=16 1.8:x= 3 4 : 1 4

解比例和方程. 75:x=25:15 24%x+8%x=16 1.8:x= 3 4 : 1 4 0.25 x = 0.5 2 .
2025-03-07 06:19:48
推荐回答(1个)
回答1:

(1)75:x=25:15,
           25x=75×15,
       25x÷25=1125÷25,
             x=45;

(2)24%x+8%x=16,
         32%x=16,
    32%x÷32%=16÷32%,
            x=50;

(3)1.8:x=
3
4
1
4

       
3
4
x=1.8×
1
4

    
3
4
x ÷
3
4
=
9
20
÷
3
4

          x=
3
5


(4)
0.25
x
=
0.5
2

      0.5x=0.25×2,
 0.5x÷0.5=0.5÷0.5,
         x=1.