题目内容
求未知数.
:
=x:241+20%x=1.84x-2.5×3=12.5.
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x=15;
1+20%x=1.8,
0.2x=1.8-1,
0.2x=0.8,
x=4;
4x-2.5×3=12.5,
4x-7.5=12.5,
4x=12.5+7.5,
4x=20,
x=5.
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