试题:
求X
①4X+0.8=1.2

②2.7:X=8.1:9

③2X-19=49.
解方程 2016-05-21

答案:

我来补答
①4X+0.8=1.2,
4X+0.8-0.8=1.2-0.8,
4X=0.4,
4X÷4=0.4÷4,
X=0.1;

②2.7:X=8.1:9,
8.1X=2.7×9,
8.1X÷8.1=24.3÷8.1,
X=3;

③2X-19=49,
2X-19+19=49+19,
2X=68,
2X÷2=68÷2,
X=34.
 
 
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