5,2.1x一0.3x=18
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2 小时前 lz81031022|七级 5.2-0.36x=7-0.51x 0.51x-0.36x=7-5.2
方程bx-5.2=0.3与26x-4.3=8.7的解相同,求b 2.1的值
3(x 2.1)=10.
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