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Henry: How are you getting along with your translation?
Alice: 56 .
Bill: How's your mother feeling these days?
Nancy: 57 .
Fred: Do you like a cup of coffee or tea?
Jane: 58 .
George: Shall we do it now?
Mary: 59 .
Pat: When will you go?
Ann: 60 .
56.D
57.G
58.A
59.B
60.C
给定曲线y=x3与直线y=px-q(其中p>0)，求P与q为何关系时，直线y=px-q是y=x3的切线.
y”-2y′-3y=O的通解是.
yInxdx+xInydy=0的通解是.
