5x+2x=33.6,7x-4x=0.75,2x+7x+2.1=12,56x-32x-119=361,解方程

来源：学生作业帮编辑：作业帮分类：数学作业时间：2024/05/09 11:48:27

5x+2x=33.6,
7x=33.6;
x=4.8;
7x-4x=0.75,
3x=3/4;
x=1/4;
2x+7x+2.1=12,
9x=8.1;
x=0.9;
56x-32x-119=361
24x=480;
x=20;
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再答： 7x-4x=0.75 3x=0.75; x=0.75÷3; x=0.25;

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