花布长42米,比白布多3\4,白布长多少米?请大家讲讲
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花布长42米,比白布多3\4,白布长多少米?请大家讲讲
花布长42米,比白布多3\4,白布长多少米?
请大家讲讲
花布长42米,比白布多3\4,白布长多少米?请大家讲讲
42×3/4=31.5
设白布为x 则花布是7/4x 所以24米
设白布是X
X+3/4X=42
7/4X=42
X=42x4/7
X=24
答:X=24米