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+//problem 7 pagenumber 2.91
+//given
+format(6);
+r1=1e3;//ohm
+r2=100e3;//ohm
+rf1=90e3;//ohm
+//determine cmrr
+ac=(r2-rf1)/(r1+r2);
+ad=(rf1+((((rf1+r1)/r1)*r2)/(r1+r2)))/r1;format(12);
+disp( 'CMRR = '+string(ad/(ac)));//no unit
+