Is the triangle with EA equal to 5 / 4, B equal to 3 / 4, C equal to e a right triangle

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• 1. What's the solution of one fifth plus x equals nine twentieth
• 2. It is known that a × 4 / 3 = 11 / 12 × B = 5 / 5 × C, and ABC is not equal to 0. Please arrange the three numbers of ABC in descending order and explain why they are arranged in this way
• 3. 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?
• 4. A △ 6 / 7 = B × 6 / 5 = C × 5 / 6, where ABC is a natural number and is not zero, the three numbers of ABC are arranged in the order from small to large
• 5. If the product of two factors is 80, one factor is reduced by 8 times, and the other factor remains unchanged, then the product is ()
• 6. The product of two numbers is 70. One factor is expanded to 100 times of the original, and the other is reduced by one tenth. The product is 70
• 7. Given AXB = 280, if a expands 3 times and B remains unchanged, then the product is (); if B shrinks 5 times and a remains unchanged, then the product is (); if a expands 5 times and B also expands 5 times, then the product is ()
• 8. When two numbers are multiplied, one factor is reduced by 10 times, and the other factor is increased by 20 times. Their product is the original______ Times
• 9. The product of the two factors is 3.45. If one factor is expanded by eight times and the other factor is reduced by one third, what is the product now?
• 10. When two numbers are multiplied, one factor is expanded by 8 times and the other factor is reduced by half, and the product is 360, then the original product is 360________ . (with explanation)
• 11. Let the lengths of the three sides of a right triangle be a, B and C respectively. If C-B = B-A > 0, then C-A of C + A is equal to? Second grade mathematics multiple choice questions! A. One half B. One third C. A quarter D. One in five
• 12. 1. If a = two-thirds of B, and a is not equal to 2, then A-B + 1 of a + B-5 is equal to? 2. Given 1 / X-1 / y = 3, then the value of the algebraic formula x-2xy-y 2x-14xy-2y is?
• 13. The number a is five times the number B. if the number a plus 4 and the number B minus 1.6, then the number a is five times the number B
• 14. One fourth of the number a is equal to three fifths of the number B (both a and B are not zero)
• 15. If 60% of the number a is equal to three-thirds of the number B, and both a and B are not zero, then () whether the number a is greater than the number B or less than the number B or equal to the number B
• 16. If two-thirds of a is equal to three-quarters of B, then a: B =?
• 17. 12 - Four Thirds equals
• 18. Matlab dichotomy programming Using dichotomy to find the root of the equation: X * x + 53.99x-0.054 = 0
• 19. If the square of (a + 1) + the square of (2b-3) + |c-1 | = 0, find the value of the cubic power of 3ABC + a-c
• 20. In parallel circuit, why is the total resistance equal to the reciprocal sum of the branch resistances?