题目内容
解方程.
(1)7x÷3=8.19
(2)4x-0.5x=0.7
(3)3.5×6-3x=11.4.
(1)7x÷3=8.19
(2)4x-0.5x=0.7
(3)3.5×6-3x=11.4.
(1)7x÷3=8.19,
x=8.19,
x×
=8.19×
,
x=3.51;
(2)4x-0.5x=0.7,
3.5x=0.7,
3.5x÷3.5=0.7÷3.5,
x=0.2;
(3)3.5×6-3x=11.4,
21-3x+3x=11.4+3x,
11.4+3x=21,
11.4+3x-11.4=21-11.4,
3x÷3=9.6÷3,
x=3.2.
7 |
3 |
7 |
3 |
3 |
7 |
3 |
7 |
x=3.51;
(2)4x-0.5x=0.7,
3.5x=0.7,
3.5x÷3.5=0.7÷3.5,
x=0.2;
(3)3.5×6-3x=11.4,
21-3x+3x=11.4+3x,
11.4+3x=21,
11.4+3x-11.4=21-11.4,
3x÷3=9.6÷3,
x=3.2.
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