UPSKILL MATH PLUS

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1.91a+13 \(=\) i(ia+i)
 
[Note: Insert the constant factor in the first box followed by variable factor]
 
 
2.9s4t26st3+15s5t \(=\) \(st\)is3tit2+is4
 
[Note: Insert the suitable coefficient in the answer box after factorizing the expression]