Put the nine numbers 1, 2, 3, 4, 5, 6, 7, 8 and 9 into the following nine squares, each number can only be used once, so that the equation holds. □ × □ × (□ + □ + □) × (□ + □ -) = 2002

Put the nine numbers 1, 2, 3, 4, 5, 6, 7, 8 and 9 into the following nine squares, each number can only be used once, so that the equation holds. □ × □ × (□ + □ + □) × (□ + □ -) = 2002

2002 = 2 × 7 × 11 × 13, 9 + 8-6 = 11, 1 + 3 + 4 + 5 = 13, so the answer is: 2 × 7 × (1 + 3 + 4 + 5) × (9 + 8-6) = 2002

Let a be an M × n matrix, C be an invertible matrix of order n, the rank of matrix A is R1, and the rank of matrix B = AC is r, then
A ,r>r1 B,r

Since C is reversible, R (AC) = R (a)
That is, r = R1
So (c) is correct

The rule of sequence 5.8.13.21.34.55.89 is: from the third number, each number is the sum of the two numbers in front of him, and the number 2012 is divided by five
What is the remainder

Start with the first one and write down the remainder
0、3、3、1、4、0、4、4、3、2、0、2、2、4、1、0、1、1、2、3、
0、3、3、1、4、0、4、4、.
A total of 20 cycles,
2012 / 20 = more than 100, the 12th remainder is 2,
The number in 2012 is divided by five, and the remainder is 2

How many centimeters does "five feet seven inches" equal
fast

1 foot = 12 inches,
1 inch = 2.54 cm
5 × 12 + 7 = 67 inches
67 × 2.54 = 170.18 cm

What is the sum of 3 / 7 of 7 / 24 and 7 / 8

7/24×3/7＋7/8
＝1/8＋7/8
＝1

(1)（-ab+2)(5ab-3)-ab(1-ab) (2)(-2x)·(x^2-5x+6)-4x(2x^2-3x+1)

（-ab+2)(5ab-3)-ab(1-ab)
=-5a^2b^2+13ab-6-ab+a^2b^2
=-4a^2b^2+12ab-6
(-2x)·(x^2-5x+6)-4x(2x^2-3x+1)
=-2x^3+10x^2-12x-8x^3+12x^2-4x
=-10x^3+22x^2-16x

Li Hong read a story book. On the first day, she read 1 / 4 of the book. On the second day, she read 60% of the book. There are 45 pages left. How many pages are there?

The first day is 25%, the second day is 60%, and the remaining 15% is 45 pages

The circumference of an isosceles triangle vegetable field is 180 meters, the waist length is 50 meters, and the height at the bottom is 30 meters. How many square meters is the area of this vegetable field?

Isosceles triangle vegetable field (with two waist), circumference is 180 meters, waist length is 50 meters
So the top and bottom = 180-50-50 = 80
The height at the bottom is 30 meters
therefore
The area of this vegetable field = 0.5 * (top and bottom) * height = 40 * 30 = 1200 square meters
A: the area of this vegetable field is 1200 square meters

Xiao Wang rides a bicycle from a to B, and he does one third of the whole journey in three hours. At this speed, how much of the whole journey can he do in eight hours?

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If a is a rational number, compare a and a / 10
A / 10 reads:

If a > 0, then a > A / 10
If a = 0, then a = A / 10
If a < 0, then a < A / 10