问题 解答题
解方程.
x×(1-
4
9
)=
5
6

x+
7
9
x=2

11x-50%=16
(x+
2
7
)×40%=8.
答案

(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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