花布长42米,比白布少4分之三,白布长多少米?
要用方程
人气:271 ℃ 时间:2020-05-10 16:38:54
解答
2÷(1-3/4)
=2÷1/4
=8米方程呀42÷(1-3/4)=42÷1/4=168米 设 白布x米x-3/4x=451/4x=42x=168
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