求未知数X:48÷13-0.4X=4 0.5
1个回答
展开全部
(1)48÷
-0.4x=4,
144-0.4x=4,
144-0.4x+0.4x=4+0.4x,
4+0.4x-4=144-4,
0.4x÷0.4=140÷0.4,
x=350;
(2)0.5x+2x=11
,
2.5x=11
,
2.5x÷2.5=11
÷2.5,
x=
×
,
x=
;
(3)
:
= 1
:x,
x=
×1
,
x=
×
x×3=
× 3,
x=
.
1 |
3 |
144-0.4x=4,
144-0.4x+0.4x=4+0.4x,
4+0.4x-4=144-4,
0.4x÷0.4=140÷0.4,
x=350;
(2)0.5x+2x=11
1 |
5 |
2.5x=11
1 |
5 |
2.5x÷2.5=11
1 |
5 |
x=
56 |
5 |
2 |
5 |
x=
112 |
25 |
(3)
1 |
3 |
1 |
20 |
7 |
9 |
1 |
3 |
1 |
20 |
7 |
9 |
1 |
3 |
1 |
20 |
16 |
9 |
1 |
3 |
4 |
45 |
x=
4 |
15 |
推荐律师服务:
若未解决您的问题,请您详细描述您的问题,通过百度律临进行免费专业咨询