设y=2x^2-x,当x=1,Δx=0.01时,求Δy和dy
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设函数y=2x+1,当自变量x由0变到0.02时,求函数的增量△y和微分dy.(我要...
设函数y=x^2+x,计算在x=2处当△x分别等于1,0.1,0.01时的△y及dy.