Mathematics problem, judging the lower fraction Is 1 / A + 4 a fraction?

The denominator has unknowns
So it's a fraction

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1. The power loss of the conductor is 20% of the transmission power when the voltage of 220 V is used in a substation. If the power loss of the conductor is to be reduced to 5% of the transmission power, what is the transmission voltage?
2. It is known that the linear function y = (3m + 1) x-m-1 about X 1. When m is the value, the image passes (0,2) 2. Which quadrants does the image pass through 3. Can you write out the relation between this line and another line which is symmetrical on the X axis
3. The resistance of a conductor is 2 ohm. What's its power when it passes 2 a current? How many joules of heat are produced in one minute?
4. The sum of two two digits is 68. Write the smaller two digits on the right side of the larger two digits to get a four digit number. Write the smaller two digits on the left side of the larger two digits to get a four digit number. It is known that the former four digits are 2178 larger than the latter four digits. Find the two two two digits Using 2-element linear equations
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9. How to solve the problem that the circuit is changed from series connection to parallel connection, and the indication change of ammeter and voltmeter after moving the sliding rheostat in the circuit? It's better to have a problem-solving routine, The quantity is there, but because I don't understand it very well, the more I do it, the more confused I am.
10. Let me ask you a question that you have answered before. Is it possible that the equation (2M2 + M-3) x ^ (M + 1) + 5x = 13 of X is a quadratic equation of one variable? The degree on X is m + 1 one (2m²+m-3)x^(m+1)+5x=13 If it is a quadratic equation of one variable, two conditions should be satisfied 1）m+1=2,m=1 2)2m²+m-3≠0 When m = 1, the above formula = 2 + 1-3 = 0, which does not meet the requirements So it can't be a quadratic equation of one variable two It's similar to the question M-1 = 2, then M = 3 Substituting M = 3 into 2m & # 178; + M-3, we get: 2m²+m-3=2×9+3-3=18≠0 So this could be a quadratic equation of one variable How does m + 1 become M-1 = 2, then M = 3 Substituting M = 3 into 2m & # 178; + M-3, we get: 2m²+m-3=2×9+3-3=18≠0 So this could be a quadratic equation of one variable
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