Good day guys, this is an update of my previous thread on Civil Engineering Board Exam Problems with Calculator Techniques (Casio fx-991es or fx-991es plus). Actually kunti lang naman pinagkaiba nang fx-570es or fx-570es plus sa fx-991es or fx-991es plus in terms of function keys and in power source medyo advance lang si 991es kasi may solar source siya and hindi na siya acceptable sa PRC board exam. But in general no need to worry if nasanay kayo sa fx-991es or fx-991es plus kasi almost same lang ang function sa fx-570es or fx-570es plus.
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