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解方程.
x×(1−
4
9
)=
5
6

x+
7
9
x=2

11x-50%=16
(x+
2
7
)×40%=8.
人气:214 ℃ 时间:2020-04-02 12:20:18
解答
(1)x×(1-
4
9
)=
5
6

               
5
9
x=
5
6

            
5
9
9
5
=
5
6
×
9
5

                 x=
3
2

(2)x+
7
9
x=2,
     
16
9
x=2,
 
16
9
9
16
=2×
9
16

         x=
9
8

(3)11x-50%=16
 11x-50%+50%=16+50%,
         11x=16.5,
     11x÷11=16.5÷11,
           x=1.5;
(4)(x+
2
7
)×40%=8,
(x+
2
7
)×40%÷40%=8÷40%,
             x+
2
7
=20,
          x+
2
7
-
2
7
=20-
2
7

               x=19
5
7
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