• # question_answer 17) 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. (Hints Three possible expressions are $5+(8-7),5-(8-7),(5\text{ }x\text{ }8)+7,$make the other expressions.)

The possible expressions formed by three numbers 5, 7 and 8 are $5+(8-7),5-(8-7),(5\times 8)+7,(5+8)+7,$ $5-(8\times 7),(5+8)-7,(5\times 8)-7,8\times (7+5)$etc.