HP 40gs, Руководство пользователя

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13-18 Using mathematical functions
Examples
ISOLATE(2*X+8,X) returns -4
ISOLATE(A+B*X/C,X) returns -(A*C/B)
LINEAR?
Tests whether expression is linear for the specified
variable . Returns 0 (false) or 1 (true).
LINEAR?( expression , variable )
Example
LINEAR?((X^2-1)/(X+1),X) returns 0
QUAD
Solves quadratic expression= 0 for variable and returns
a new expression, where variable=newexpression. The
result is a general solution that represents both positive
and negative solutions by including the formal variable
S1 to represent any sign: + or – .
QUAD( expression , variable )
Example
QUAD((X - 1)
2
-7,X) returns (2+s1*(2*
√
7))/2
QUOTE
Encloses an expression that should not be evaluated
numerically.
QUOTE( expression )
Examples
QUOTE(SIN(45)) F1(X) stores the
expression SIN(45) rather than the value of SIN(45).
Another method is to enclose the expression in single
quotes.
For example, X^3+2*X F1(X) puts the
expression X^3+2*X into F1(X) in the Function
aplet.
| (
where)
Evaluates expression where each given variable is set to
the given value . Defines numeric evaluation of a symbolic
expression.
expression |( variable1=value1, variable2=value2,... )
Example
3*(X+1)|(X=3) returns 12 .
hp40g+.book Page 18 Friday, December 9, 2005 1:03 AM