Problem description:

Now senior three, next year's college entrance examination. I want to know some application skills of function calculator in mathematics, and I hope my friends who know it can tell me some!

Take fx-82MS as an example. This is the model I am using now. )

Analysis:

Fx-82ES model is highly recommended, with function list function.

As for fx-82MS:

3(REG is a functional model.

Among them, Lin and Quad are commonly used.

Lin is a linear regression and a linear function.

Y=Bx+A (pay attention to a and b when it is different from the conventional usage)

Practical method:

1 Enter two coordinate points to find the function.

For example, find the analytical formula (y = 2x+1) of the known points (1, 3) and (0,1).

First enter the coordinates of the point.

Keys: "1", "3" and "M+" (display: n= 1)

"0", "1", "M+ 0" and "M+" (display: n=2)

Then press: Shift""2 move right 1 =

Gets the value of

Shift""2 Right Right 2 =

Get the value of b

(y=Bx+A, don't copy it wrong! )

2 After obtaining the analytical formula y=2x+ 1, find out whether X is known or whether Y is known.

Press 5, Shift, 2, Right, Right, 2 =

Get the value of y when x=5 (1 1).

Press "11"shift "2" right "right"1"="

Get the value of x (5) when y= 1 1.

Quad is a quadratic regression and a quadratic function.

Y = the square of Y=Cx +Bx+A (when it is different from the conventional usage, please pay attention to A, B and C)

Use the same as forest, but the quadratic function needs more than three points to determine.

Note: If the input point does not satisfy the analytical formula, it will be approximated.

For example, in Lin, enter (0,0) (1,1) (2, 1.9).

Y = 0.95 x+0.0 165438 is found. 56866