问题
解答题
解方程 75%x-
|
答案
(1)75%x-
x=11 2
×6,7 8
25%x=
,45 4
25%x÷25%=
÷25%,45 4
x=45;
(2)6(x-2)=4(x+7),
6x-6×2=4x+4×7,
6x-12=4x+28,
6x-12+12=4x+28+12,
6x=4x+40,
6x-4x=4x+40-4x,
2x=40,
2x÷2=40÷2,
x=20;
(3)x:12=
:18%,3 20
18%x=12×
,3 20
18%x=1.8,
18%x÷18%=1.8÷18%,
x=10.