Form four expressions with numbers $7$ , $5$ and $8$ (variable) using operations of addition, subtraction or multiplication with the condition that every number should be used but not more than once.

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Solution

The expressions formed from the given numbers that satisfies the conditions given in the questions are:
$(7 \times 5) - 8, (5 \times 8) + 7, (7 - 5) + 8, 5 \times (7 + 8)$

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Question 1

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.

Make up as many expressions with numbers (no variables) as you can from three numbers $6$ , $8$ and $9$ . Every number should be used not more than once. Use only addition, subtraction and multiplication.

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.)

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Form four expressions with numbers 7,5 and 8 (variable) using operations of addition, subtraction or multiplication with the condition that every number should be used but not more than once.

The expressions formed from the given numbers that satisfies the conditions given in the questions are:7×5-8,5×8+7,7-5+8,5×7+8

Form four expressions with numbers $7$ , $5$ and $8$ (variable) using operations of addition, subtraction or multiplication with the condition that every number should be used but not more than once.

The expressions formed from the given numbers that satisfies the conditions given in the questions are:
$(7 \times 5) - 8, (5 \times 8) + 7, (7 - 5) + 8, 5 \times (7 + 8)$