HP 20b HP 20b Calculator Quick Start Guide - Page 24
Simple Arithmetic Calculations in RPN Mode
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Mathematical Calculations You do not need to enter parentheses to set the priority of your operations in RPN. Key in numbers and operations inside the parentheses first, followed by those outside of the parentheses. If a problem has more than one set of parentheses, start by working with the operations and numbers in the innermost parentheses and work out. For example, calculate: (3 + 4) x (5 + 6). One way to calculate this problem is to key in the numbers and operations within the parentheses first, followed by the operations outside of the parentheses. See Table 2-2 below. Table 2-2 Simple Arithmetic Calculations in RPN Mode Keys Display 3I4+ 5I6+ Description Inputs the numbers and the operation in the first set of parentheses. Intermediate results are displayed. Note the (+) and (RPN) annunciators. Inputs the numbers and the operation in the second set of parentheses. Intermediate results are displayed. Note the (+) annunciator. 24