
求未知数x(1)45X+112=216;(2)x:5.6=5:3.5.
1个回答
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(1)
X+1
=2
,
X+1
-1
=2
-1
,
X=
,
X÷
=
÷
,
X=
;
(2)x:5.6=5:3.5,
3.5x=5.6×5,
3.5x=28,
3.5x÷3.5=28÷3.5,
x=8.
4 |
5 |
1 |
2 |
1 |
6 |
4 |
5 |
1 |
2 |
1 |
2 |
1 |
6 |
1 |
2 |
4 |
5 |
2 |
3 |
4 |
5 |
4 |
5 |
2 |
3 |
4 |
5 |
X=
5 |
6 |
(2)x:5.6=5:3.5,
3.5x=5.6×5,
3.5x=28,
3.5x÷3.5=28÷3.5,
x=8.
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