问题
解答题
求未知数x
|
答案
(1)4x-4×
=18,1 2
4x-2=18,
4x-2+2=18+2,
4x=20,
4x÷4=20÷4,
x=5;
(2)
=36 x
,54 3
54x=36×3,
54x=108,
54x÷54=108÷54,
x=2;
(3)3x+x+6=26,
4x+6=26,
4x+6-6=26-6,
4x=20,
4x÷4=20÷4,
x=5;
(4)
:1 5
=1 2
:x,1 0.25
x=1 5
×1 2
,1 0.25
x=2,1 5
x÷1 5
=2÷1 5
,1 5
x=10.