养兔专业户共养兔50只,白兔和黑兔共33只,白兔和灰兔共37只.白兔、黑兔和灰兔各养
A.白兔:22只,黑兔:11只,灰兔13只B.白兔:20只,黑兔:13只,灰兔17只C.白兔:17只,黑兔:20只,灰兔13只D.白兔:15只,黑兔:18只,灰兔20只B
灰兔:50-33=17(只)黑兔:50-37=13(只)白兔:33-13=20(只)选B.
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