问题
解答题
解方程.
|
答案
(1)1÷﹙x÷
-3 5
×3 4
﹚=2 3
,3 8
1÷﹙x×
-5 3
﹚=1 2
,3 8
x-5 3
=1÷1 2
,3 8
x-5 3
=1 2
,8 3
x-5 3
+1 2
=1 2
+16 6
,3 6
x×5 3
=3 5
×19 6
,3 5
x=1.9;
(2)80%x-30+10=
(x-10),3 4
0.8x-30+10=0.75x-7.5,
0.8x-0.75x+30-30+10-10=0.75x-0.75x+30-10-7.5,
0.05x=12.5,
0.05x÷0.05=12.5÷0.05,
x=250;
(3)
x+8=33-3 4
﹙x-5﹚,2 3
x+8=33-3 4
x+2 3
×5,2 3
x+8=33-9 12
x+8 12
,10 3
x+9 12
x+8=33+8 12
x-8 12
x+8 12
,10 3
x+8-8=33-8+17 12
,10 3
x=17 12
+75 3
,10 3
x×17 12
=12 17
×85 3
,12 17
x=20.