15.李明在电脑上把一幅长6厘米.宽4厘米的照片放大,放大后照片的长是13.5厘米,宽是多少厘米?解:设放大后照片的宽是x厘米,以下解答所列方程正确的是( )
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A. | 13.5:6=4:x | B. | $\frac{x}{13.5}$=$\frac{4}{6}$ | C. | 13.5:x=4:6 | D. | 13.5:4=6:x |