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+//===========================================================================
+//chapter 10 example 10
+
+
+clc;
+clear all;
+
+//variable declaration
+P	= 100;		//resistance in Ω
+Q	= 100;		//resistance in Ω
+S	= 230;		//resistance in Ω
+dP	= 0.02;		//limiting error(dP/P) in  %
+dQ	= 0.02;		//limiting error(dQ/Q) in  %
+dS	= 0.01;		//limiting error(dS/S) in  %
+
+//calculations
+R	= (P/Q)*S;		//unknown reistance in Ω
+dR	=dP+dQ+dS;	//limiting error(dR/R) in %
+dR1 = (dR*R)/100;
+R1	= R-dR1;		//limitng values of unknown resistance in Ω
+R2	= R+dR1;		//limitng values of unknown resistance in Ω
+
+//result
+mprintf("unknown resistance  = %3.0f Ω ",R);
+mprintf("limitng values of unknown resistance %3.3f Ω to %3.3f  Ω",R1,R2);