解方程. 1/6:4/5=x:48 (1+2/3)x=6.25 0.26×3-0.9x=6%

问题描述:

解方程.

1
6
4
5
=x:48
(1+
2
3
)x=6.25
0.26×3-0.9x=6%

(1)

1
6
4
5
=x:48,
           
4
5
x=
1
6
×48,
       
4
5
4
5
=
1
6
×48÷
4
5

             x=10;
(2)(1+
2
3
)x=6.25,
          
5
3
x=6.25,
       
5
3
5
3
=6.25÷
5
3

             x=3.75;
(3)0.26×3-0.9x=6%,
        0.78-0.9x=6%,
   0.78-0.9x+0.9x=6%+0.9x,
             0.78=6%+0.9x,
          0.78-6%=6%+0.9x-6%,
             0.72=0.9x,
        0.72÷0.9=0.9x÷0.9,
                x=0.8.