If a, B and C are rational numbers that are not equal to 0, what is the result of a / [a] + B / [b] + C / [C]? None

If a, B and C are rational numbers that are not equal to 0, what is the result of a / [a] + B / [b] + C / [C]? None

It's three

If AB is any two rational numbers not equal to 0, compare the size of a + B and 0

Classification discussion:
a. When b > 0, a + b > 0
a,b0
A0, and | a | > | B |, a + B

What's 7 out of 8-4 out of 9-1 out of 6

7/8-4/9-1/6
=63/72-32/72-12/72
=(63-32-12)/72
=19/72

Given that the image of a linear function y = (M + 2) x + M & sup2; - M-4 passes through a point (0,2), then the value of M is

Substituting x = 0, the value of Y is 2
M & sup2; - M-4 = 2, M = 3 or M = - 2

2008 + 200.8 + 20.8 + 2.008 + 1992 + 199.2 + 19.92 + 1.992 simple calculation method

（2008+1992）+（200.8+199.2）+（20.08+19.92）+（2.008+1.992）=4000+400+40+4=4444

For a right triangle, the ratio of the length of the three sides is 3:4:5. If the perimeter of the triangle is 96 cm, how many square centimeters is its area?

3+4+5=12
96*（3/12）=24
96*（4/12）=32
96*（5/12）=40
The two right angles are 24 cm and 32 cm
Area = 24 * 32 / 2 = 384 square centimeter

Find the greatest common divisor and least common multiple of 9 and 12, 7 and 11, 15 and 4, 18 and 24 and 42, 26 and 78, 10 and 18, 13 and 52, 2 and 3 and 7

9 and 12: greatest common divisor 3, least common multiple 367 and 11: greatest common divisor 1, least common multiple 7715 and 4: greatest common divisor 1, least common multiple 6018 and 24 and 42: greatest common divisor 6, least common multiple 50426 and 78: greatest common divisor 13, least common multiple 7810 and 18: greatest common divisor 2, least common multiple 9013 and 5

The area of the triangle ABC is 1, and the length of each side is extended by one time respectively. What is the area of the new triangle def

As shown in the figure, connect CE, AF, BD, ∵ AC = ad, s △ ABC = 1, ∵ s △ abd = s △ abd = s △ ABC = 1, similarly, s △ ACF = s △ ABC = s △ ADF = 1, s △ BCE = s △ ABC = s △ CEF = 1, ∵ s △ def = 1 + 1 + 1 + 1 + 1 + 1 + 1 = 7

Solving the equation - 1 x + 40 = 50
Process

-x=50-40
-x=10
x=-10
So the solution of the original equation is x = - 10

A triangular piece of glass has a bottom of 12.5 decimeters and a height of 7.8 decimeters. If the price of glass per square decimeter is 0.8 yuan, how much does it cost to buy this piece of glass?

The area of triangle glass is: 12.5 × 7.8 △ 2, = 97.5 △ 2, = 48.75 (square decimeter); 48.75 × 0.8 = 39 (yuan); a: it costs 39 yuan to buy this glass