Fill in the blanks 1. If seven a equals eight B equals nine C (ABC is not equal to 0), then a + B-C a + B + C equals () 2. The hour hand and minute hand form a () angle at two o'clock, and the hour hand and minute hand form a flat angle at two o'clock. Every hour, the angle that the minute hand turns is () angle. 3. It takes a quarter of an hour and a sixth of an hour to process the same kind of parts. The efficiency of the work of a and B is six pages less than () 4. Xiao Ming read a book and read a quarter of the whole book on the first day, There are still four fifths left. He should look at it from page () the next day. 5. The last step of a calculation problem should be to divide by ten, but a careless student wrongly multiplied by ten in the last step. His answer is 500. The correct answer to the original problem should be () 6, a = 2 * 3 * m, B = 3 * 5 * m (M is a natural number and M is not 0), Then M is () 7. When a bottom edge of the trapezoid is gradually shortened to a point, the trapezoid becomes () shape. When a shorter edge of the trapezoid is gradually extended to be equal to the other edge, the trapezoid becomes () shape. 8. Use 1260 square cubes with 1 cm edge length to pile up a cuboid, in which the difference between the largest and smallest surface area is () square centimeter?

Fill in the blanks 1. If seven a equals eight B equals nine C (ABC is not equal to 0), then a + B-C a + B + C equals () 2. The hour hand and minute hand form a () angle at two o'clock, and the hour hand and minute hand form a flat angle at two o'clock. Every hour, the angle that the minute hand turns is () angle. 3. It takes a quarter of an hour and a sixth of an hour to process the same kind of parts. The efficiency of the work of a and B is six pages less than () 4. Xiao Ming read a book and read a quarter of the whole book on the first day, There are still four fifths left. He should look at it from page () the next day. 5. The last step of a calculation problem should be to divide by ten, but a careless student wrongly multiplied by ten in the last step. His answer is 500. The correct answer to the original problem should be () 6, a = 2 * 3 * m, B = 3 * 5 * m (M is a natural number and M is not 0), Then M is () 7. When a bottom edge of the trapezoid is gradually shortened to a point, the trapezoid becomes () shape. When a shorter edge of the trapezoid is gradually extended to be equal to the other edge, the trapezoid becomes () shape. 8. Use 1260 square cubes with 1 cm edge length to pile up a cuboid, in which the difference between the largest and smallest surface area is () square centimeter?

1. If 7 / a equals 8 / b equals 9 / C (ABC is not equal to 0), then a + B-C / A + B + C equals (1 / 4) 2, two points exactly, the hour hand and minute hand form (60 °) angle, (6) points exactly, the hour hand and minute hand form a flat angle

Given that a * 7 / 2 equals B8 / 8 equals c * 13 / 21, and ABC is not zero, what is a: B: C?

Suppose a * 7 / 2 equals B8 / 8 equals c * 13 / 21 equals K
Then a = K / (7 / 2), B = K / (8 / 8), C = K / (13 / 21)
a=2k/7 b=k,c=21k/13
a:b:c=2/7:1:21/13=26:91:147

It is known that a × 4 / 3 = 1 / 12 × B = 5 / 5 × C, and ABC is not equal to 0. Please rank ABC from large to small and explain the reason
Don't be too wordy, try to be concise, to understand meow, thank you for meow~
(good answer, bonus, meow)

A × 4 / 3 = 1 / 12 × B = 5 / 5 × C
12 × 5 × 4 × a = 3 × 5 × B = 12 × 3 × 5 × C
16A=B=12C
So b > C > A