求未知数x1.8-14x=
1个回答
展开全部
(1)8-
x=0.4
8-
x+
x=0.4+
x
8=0.4+
x
8-0.4=0.4+
x-0.4
7.6=
x
x÷
=7.6÷
x=30.4
(2)x:
=
:
x=
×
x=
x÷
=
÷
x=
(3)9x+3.3x-7=21.29
(9+3.3)x-7=21.29
12.3x-7+7=21.29+7
12.3x=28.29
12.3x÷12.3=28.29÷12.3
x=2.3
1 |
4 |
8-
1 |
4 |
1 |
4 |
1 |
4 |
8=0.4+
1 |
4 |
8-0.4=0.4+
1 |
4 |
7.6=
1 |
4 |
1 |
4 |
1 |
4 |
1 |
4 |
x=30.4
(2)x:
1 |
20 |
7 |
9 |
1 |
3 |
1 |
3 |
1 |
20 |
7 |
9 |
1 |
3 |
7 |
180 |
1 |
3 |
1 |
3 |
7 |
180 |
1 |
3 |
x=
7 |
60 |
(3)9x+3.3x-7=21.29
(9+3.3)x-7=21.29
12.3x-7+7=21.29+7
12.3x=28.29
12.3x÷12.3=28.29÷12.3
x=2.3
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