Question

a+(a+d) +(a+2d)+--------+[a+(n-1)d] = n/2 [2a+(n-1)d] solve by mathematical induction ​

Answer 1

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Answer 2

Answer:

$7 + 7 \div 7 + 7 \times 7 - 7 \\ = 7 + (7 \div 7) + 7 \times 7 - 7 \\ = 7 + 1 + (7 \times 7) - 7 \\ = 7 + 1 + 49 - 7 \\ = (7 + 1) + 49 - 7 \\ = 8 + 49 - 7 \\ = 57 - 7 \\ = 50(answer$