题目内容
解方程:
x÷
=
7.2-2x=3.8
x+
x=15.
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①
x÷
=
,
x÷
×
=
×
,
x÷
=
÷
,
x=
;
②7.2-2x=3.8,
7.2-2x+2x=3.8+2x,
3.8+2x=7.2,
3.8+2x-3.8=7.2-3.8,
2x÷2=3.4÷2,
x=1.7;
③
x+
x=15
x=15
x÷
=15÷
x=18.
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x=
| 7 |
| 16 |
②7.2-2x=3.8,
7.2-2x+2x=3.8+2x,
3.8+2x=7.2,
3.8+2x-3.8=7.2-3.8,
2x÷2=3.4÷2,
x=1.7;
③
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x=18.
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