解方程:2x+0.82﹦8.23+0.5x﹦77.8÷x﹦2.680x÷4﹦125-0.9x﹦2.752x+0.4x=4
来源:学生作业帮 编辑:大师作文网作业帮 分类:数学作业 时间:2024/10/01 12:57:50
解方程:
2x+0.82﹦8.2 | 3+0.5x﹦7 | 7.8÷x﹦2.6 |
80x÷4﹦12 | 5-0.9x﹦2.75 | 2x+0.4x=48 |
6-2x+6x=18 | 35x+13x=9.6 | 1.3x+2.4×3=12.4. |
(1)2x+0.82﹦8.2
2x+0.82-0.82﹦8.2-0.82
2x=7.38
2x÷2=7.38÷2
x=3.69;
(2)3+0.5x﹦7
3+0.5x-3﹦7-3
0.5x=4
0.5x÷0.5=4÷0.5
x=8;
(3)7.8÷x﹦2.6
7.8÷x×x﹦2.6×x
7.8=2.6x
7.8÷2.6=2.6x÷2.6
x=3;
(4)80x÷4﹦12
80x÷4×4﹦12×4
80x﹦48
80x÷80=48÷80
x=0.6;
(5)5-0.9x﹦2.75
5-0.9x+0.9x﹦2.75+0.9x
5=2.75+0.9x
5-2.75=2.75+0.9x-2.75
2.25=0.9x
2.2.5÷0.9=0.9x÷0.9
x=2.5;
(6)2x+0.4x=48
2.4x=48
2.4x÷2.4=48÷2.4
x=20;
(7)6-2x+6x=18
6+4x=18
6+4x-6=18-6
4x=12
4x÷4=12÷4
x=3;
(8)35x+13x=9.6
48x=9.6
48x÷48=9.6÷48
x=0.2;
(9)1.3x+2.4×3=12.4
1.3x+7.2=12.4
1.3x+7.2=12.4-7.2
1.3x=5.2
1.3x÷1.3=5.2÷1.3
x=4.
2x+0.82-0.82﹦8.2-0.82
2x=7.38
2x÷2=7.38÷2
x=3.69;
(2)3+0.5x﹦7
3+0.5x-3﹦7-3
0.5x=4
0.5x÷0.5=4÷0.5
x=8;
(3)7.8÷x﹦2.6
7.8÷x×x﹦2.6×x
7.8=2.6x
7.8÷2.6=2.6x÷2.6
x=3;
(4)80x÷4﹦12
80x÷4×4﹦12×4
80x﹦48
80x÷80=48÷80
x=0.6;
(5)5-0.9x﹦2.75
5-0.9x+0.9x﹦2.75+0.9x
5=2.75+0.9x
5-2.75=2.75+0.9x-2.75
2.25=0.9x
2.2.5÷0.9=0.9x÷0.9
x=2.5;
(6)2x+0.4x=48
2.4x=48
2.4x÷2.4=48÷2.4
x=20;
(7)6-2x+6x=18
6+4x=18
6+4x-6=18-6
4x=12
4x÷4=12÷4
x=3;
(8)35x+13x=9.6
48x=9.6
48x÷48=9.6÷48
x=0.2;
(9)1.3x+2.4×3=12.4
1.3x+7.2=12.4
1.3x+7.2=12.4-7.2
1.3x=5.2
1.3x÷1.3=5.2÷1.3
x=4.
解方程:2x+0.82﹦8.23+0.5x﹦77.8÷x﹦2.680x÷4﹦125-0.9x﹦2.752x+0.4x=4
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