Application problems of elementary dichotomy equations (binary) Party A and Party B set out from both places at the same time, facing each other. After meeting, they immediately returned to their original place, each taking 48 minutes. Party B set out 10 minutes earlier than Party A, then Party A and Party B met 20 minutes after starting. How long does it take for Party A to go from a to B, and Party B to go from B to a?

40 and 60
Let the velocities of a and B be x and Y respectively, then 24x + 24y = 20x + 30y, so x / y = 3 / 2
Then the time required for a is (24x + 24y) / x, and the time required for B is (24x + 24y) / y

Fractional equations X / 3 + Y / 4 = 1 x / 4 + Y / 3 = 1

It can be reduced to 4x + 3Y = 12 3x + 4Y = 12 to get x = 12 / 7 and y = 12 / 7

A parabola y = AX2 (a is not equal to 0) intersects with a straight line y = 2x -- 3 at (1, b)
Find the area of the triangle formed by the intersection and vertex of the parabola y = ax 2 and the straight line y = -- 2

Y = ax ^ 2 and line y = 2x-3 intersect at (1, b): substitute B = 2 * 1-3 = - 1, so intersection (1, - 1) so - 1 = a * 1 ^ 2A = - 1y = - x ^ 2 = 2x-3x ^ 2 + 2x-3 = 0x = - 3, x = 1x = - 3, y = - x ^ 2 = - 9, so two intersection (1, - 1), (- 3, - 9) y = - x ^ 2, vertex is (0,0) (1, - 1) and (0,0) distance is √ [(1-0) ^ 2 + (- 1-0)

50% of a number is exactly equal to the reciprocal of 1 / 50. What is the number

1÷1/50÷50%＝100

(1) 2 × half / 2 × half (2) (4-5 / 2 × 2 / 3) / 8 / 9

(1) 2 × half / 2 × half
=1×1/2×1/2
=1/2×1/2
=1/4
(2) (4-5 / 2 × 2 / 3) × 8 / 9
=(4-5/3)×9/8
=7/3×9/8
=21/8

73 times 31 plus 28 times 31 minus 31

73*31 + 28*31 - 31
= 73*31 + 28*31 - 1*31
= 31*(73+28-1)
= 31*100
= 3100

Factorize 10A & # 178; X & # 178; - abx-3b & # 178; = 0 (for the equation of X, where a is not equal to 0)

10a²x²-abx-3b²=0
(5ax-3b)(2ax+b)=0
5ax-3b=0 2ax+b=0
X = 3B / 5A or x = - B / 2A

2:5 plus negative 2:8 plus negative 1:12 plus 4:5 plus negative 1:8 plus negative 3:12

(three and two fifths plus five and three fifths) plus (five and twelve fifths minus three and five fifths) minus (two and seven eighths plus one and one eighth) equals seven
Please take the answer and support me

1. If the length of a cuboid is reduced by 2 cm, it becomes a cube. The surface area of the cube is 54 square cm, which is the same as that of the original cuboid
1. If the length of a cuboid is reduced by 2 cm, it becomes a cube. The surface area of the cube is 54 square cm,
What is the surface area and volume of the original cuboid?
2. A cuboid and a cube are combined to form a new cuboid. The surface area of the new cuboid is 60 square centimeters more than that of the original cuboid. What is the surface area of the original cuboid?
3. The area of the three different sides of the cuboid is 10 square centimeter, 45 square centimeter and 6 square centimeter respectively. What is the cuboid's volume in cubic centimeter?

1、54÷6=9 9=3×3 3×3×2+3×（3+2）×4=78 3×3×5=45
2、60÷4=15 15×6=90
3. It seems that the data is not suitable. 45 is a little big

The divisor in the division is equal to () of the fraction, and the division is equal to () of the fraction
Fill in three blanks

In division, the divisor is the numerator of the fraction, the division sign is the line of the fraction, and the divisor is the denominator of the fraction