On the polynomial (3a + 2) x2 + (9a + 10b) xy-x + 2Y + 7 of X, y without quadratic term, find the value of 3a-5b

On the polynomial (3a + 2) x2 + (9a + 10b) xy-x + 2Y + 7 of X, y without quadratic term, find the value of 3a-5b

When a = - 23, B = 35, 3a-5b = 3 × (- 23) - 5 × 35 = - 5

Mathematics in grade one is so easy that I forgot it
The linear equation of three variables is as follows
2x+y=3
3y+4z+x=8
4x-z=3

2X + y = 3, 1) 3Y + 4Z + x = 8, 2) 4x-z = 3, 3, 3, 3, 3 × 2 get: 4x + 2Y = 6, 4 - 3 get: 2Y + Z = 3, 5 get: z = 3-2y, 6 get: x = (3-y) / 2, 7 get: x = (3-y) / 2, 7 get: 3Y + 4 × (3-2y) + (3-y) / 2 = 83y + 12-8y + 1.5-1 / 2Y = 813.5-5.5y = 8y = 1, 1 get: x = 1, X get: x = 1, 3

Just forget)
Given that 0 ≤ a ≤ 4, then the maximum value of │ A-2 │ + │ 3-A │ is equal to ()
A.1 B.5 C.8 D.3

When 0 ≤ a ≤ 2, the original formula = 2-A + 3-A = 5-2a, maximum 5, minimum 1
two

Why is x + 3 / 2 = X-1 / 3 equal to zero

x-x=-3/2-1/3
0=3/2-1/3
unsolvable

PEP fifth grade volume 2 mathematics exercise book page 47 question 6
Xiao Ming does eight questions in three minutes and Xiao Hong does nine in four minutes. Who can do it fast?

Compare the size of 8 / 3 and 9 / 4
It's 32 / 12 and 27 / 12. Xiao Ming is fast

Calculation problems and the process of simplifying fraction substitution
Calculation: (π - 2) ^ 0 - 3 √ 8 + √ 2 * (- 2 / √ 8) - cos 45 degree
Simplify the fraction (x / X-1 - X / x ^ 2-1) / / x ^ 2-x / x ^ 2-2x + 1, and choose an integer x that you think is appropriate from - 1 ≤ x ≤ 3 to evaluate

(π - 2) ^ 0 - 3 √ 8 + √ 2 * (- 2 / √ 8) - cos45 ° = 1 + (5 √ 2) * √ 2 / 2 - √ 2 / 2 = 1 + 5 - √ 2 / 2 = 6 - √ 2 / 2 (x / X-1 - X / x ^ 2-1) / / x ^ 2-x / x ^ 2-2x + 1, = [x (x + 1) - x] / (x ^ 2-1) × (x-1) ^ 2 / X (x-1) = [x ^ 2] / (x-1) (x + 1) × (x-1) / x = x / (x + 1) let x = 2 original formula = 2 /

How many kilograms is 2000 cubic centimeter

Cubic centimeter is the unit of volume and kilogram is the unit of mass

Mathematics in the first year of junior high school Volume 2 geometry proof questions (preferably 20 questions)
How many to how many... People's education edition of the best 20 questions can only give so much
As long as the proof problem has a graph

1+2+3+4+5+.+100+101+102+103+104+105=?
It's not hard. It's up to you

=(1+105)×105÷2
＝5565

If "!" Is a mathematical operation symbol, and 1! =1，2！ =2×1，3！ =3×2×1，4！ =4×3×2×1… . find the value of 100! 98

∵1！ =1，2！ =2×1，3！ =3×2×1，4！ =4×3×2×1… ，∴100!98!=100×99×98×97×… ×198×97×96×… ×1=9900．