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Question
Make up as many expressions with numbers (no variables) as you can from three numbers 5, 7 and 8. Every number should be used not more than once. Use only addition, subtraction and multiplication.
(Hint: Three possible expressions are 5 + (8 − 7), 5 − (8 − 7), (5 × 8) + 7; make the other expressions.)
Solution
Many expressions can be formed by using the three numbers 5, 7, and 8.
Some of these are as follows.
- 5 × (8 − 7)
- 5 × (8 + 7)
- (8 + 5) × 7
- (8 − 5) × 7
- (7 + 5) × 8
- (7 − 5) × 8
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