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5X-1/5=0.2+3X 3(6x-7)=15x+12 5(x-8)=3x The average score of the 10 contestants is 82, the average score of the first six is 83, and the average score of the last six is 80. Then the average score of the fifth and sixth contestants is () points Xiao Ming goes to climb the mountain. When he goes up the mountain, he travels 3 kilometers per hour. When he returns from the original road, he travels 5 kilometers per hour. The average speed of Xiao Ming's round trip is () The average of 3 is ABC, the average of 10 is CDE, the average of 7 is ABCDE. C is () 5X-1/5=0.2+3X 3(6x-7)=15x+12 5(x-8)=3x
5x-3x = 0.2 + 1 / 5 2x = 0.42 x = 2 / 5 x = 0.2x = 1 / 53 (6x-7) = 15x + 1218x-21 = 15x + 123x = 33x = 115 (X-8) = 3x5x-40 = 3x2x = 40x = 20 (83 + 80) × 6-82 × 10 = 158158158 △ 2 = 79 suppose the distance is 15 km, the uphill time is 15 △ 3 = 5 hours, the downhill time is 15 △ 5 = 3 hours, the total distance is 15 × 2
X + 3x-1 = 0, x + 5x + 5x + 4
The topic should be X & 3535\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\x =; + 6x + 4 = 2 (X & # 178; + 3) + 4 = 2 + 4 =
4-3x out of 1-4 = 5x out of 6 + 2-x (- x is out of 5x out of 6 + 2)
Multiply both sides by 12, get; 12-3 (4-3x) = 2 (5x + 2) - 12x, sort out; 11x = 4, get: x = 11 / 4
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