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精编密训教材，分阶快递。Calculus AB, Calculus BC, Statistics
There are generally two types of technology users: those who don't care much about color displays, and those who can't do without them. The CASIO CFX-9850 calculator has all the essential functions for AP Calculus, an impressive array of statistical capabilities, and the ability to display graphs in different colors. The display uses orange, green, and blue colors, and you can show multiple plots in different colors, change the colors of the axes, etc. Surprisingly, this does not come at a higher cost: the few local stores I checked that sell both CASIO and comparable calculators have the CASIO 9850 models (G, GA, GA-Plus, GB, GB-Plus) $15-20 lower in price.
The other distinctive feature that becomes apparent as soon as you turn it on is that you are not presented with a blank screen. Instead, an array of 15 icons allows the user to go directly to lists, statistics, graphs, equation solvers, matrices, etc. -- and yes
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