问题
解答题
|
答案
(1)x-15=160×50%
x-15=80
x-15+15=80+15
x=95;
(2)(x+
)×40%=82 7
(x+
)×40%÷40%=8÷40%2 7
x+
=202 7
x+
-2 7
=20-2 7 2 7
x=138 7
(3 )x+5%x=19.95
105%x=19.95
105%x÷105%=19.95÷105%
x=19.
|
(1)x-15=160×50%
x-15=80
x-15+15=80+15
x=95;
(2)(x+
)×40%=82 7
(x+
)×40%÷40%=8÷40%2 7
x+
=202 7
x+
-2 7
=20-2 7 2 7
x=138 7
(3 )x+5%x=19.95
105%x=19.95
105%x÷105%=19.95÷105%
x=19.