求未知数x的值(1)0.36×5-34x=35(2)
求未知数x的值(1)0.36×5-34x=35(2)12.5-2x=4x+7.1(3)(2x+5):3=12:5....
求未知数x的值(1)0.36×5-34x=35(2)12.5-2x=4x+7.1(3)(2x+5):3=12:5.
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(1)0.36×5-
x=
1.8-
x=
1.8-
x+
x=
+
x
1.8=
+
x
1.8-
=
+
x?
1.2=0.75x
1.2÷0.75=0.75x÷0.75
x=1.6
(2)12.5-2x=4x+7.1
12.5-2x+2x=4x+7.1+2x
12.5=6x+7.1
6x+7.1-7.1=12.5-7.1
6x=5.4
6x÷6=5.4÷6
x=0.9
(3)(2x+5):3=12:5
(2x+5)×5=12×3
10x+25=36
10x+25-25=36-25
10x=11
x=1.1.
3 |
4 |
3 |
5 |
1.8-
3 |
4 |
3 |
5 |
1.8-
3 |
4 |
3 |
4 |
3 |
5 |
3 |
4 |
1.8=
3 |
5 |
3 |
4 |
1.8-
3 |
5 |
3 |
5 |
3 |
4 |
3 |
5 |
1.2=0.75x
1.2÷0.75=0.75x÷0.75
x=1.6
(2)12.5-2x=4x+7.1
12.5-2x+2x=4x+7.1+2x
12.5=6x+7.1
6x+7.1-7.1=12.5-7.1
6x=5.4
6x÷6=5.4÷6
x=0.9
(3)(2x+5):3=12:5
(2x+5)×5=12×3
10x+25=36
10x+25-25=36-25
10x=11
x=1.1.
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