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X · (x-4) · (x + 4) - (x + 3) · (x ^ 2-6x + 9) + 5x ^ 3 y ^ 2 △ x ^ 2 y ^ 2, where x = - 3 Such as the title~ Online, etc. First evaluate, then bring value
x=-3
x·(x-4)·(x+4) - (x+3)·(x^2-6x+9) + 5x^3 y^2÷x^2 y^2
= x(x^2-16) - (x+3)(x-3)^2 + 5x
= x^3 -16x - (x^2-9)(x+3) + 5x
= x^3 -16x - (x^3-9x+3x^2-27) + 5x
= x^3 -16x - x^3+9x-3x^2+27 + 5x
= -3x^2 - 2x + 27
= -3*(-3)^2 -2*(-3) +27
= -27 +6 +27
= 6
The range of function f (x) = x ^ 5-5x ^ 4 + 5x ^ 3 + 1 on [- 1,2] is
f'(x)=5x^4-20x^3+15x^2=5x^2(x^2-4x+3)=5x^2(x-1)(x-3)
When x > 3 or X
111111×999999=______ ．
111111 × 99999, = 111111 × (1000000-1), = 1000000 × 111111-111111, = 1111111000000-111111, = 111110888889
1111111 equals
2
Ask 1111111 that 222222 equals 1111111
and
1111111*1111111=1234567654321?
This formula is right
If you think about it, it's 1111111
one million one hundred and eleven thousand one hundred and eleven
one million one hundred and eleven thousand one hundred and eleven
.
.
.
one million one hundred and eleven thousand one hundred and eleven
__________
one trillion and two hundred and thirty-four billion five hundred and sixty-seven million six hundred and fifty-four thousand three hundred and twenty-one
How much is 1111 plus 7777
1111+7777=8888
Two right triangles with the same degree of acute angle are also called (), in which the degree of each acute angle is (). What kind of right triangles with acute angle have not been learned yet
I don't know how to fill in
Isosceles right triangle has not been learned, fill in this teacher will correct me wrong.
Analysis:
Two right triangles with the same degree of acute angle are also called isosceles right triangles, in which the degree of each acute angle is (45 °)!
If you don't understand, you can continue to ask,
For a right triangle, the two right sides are 4cm and 3cm respectively, and the side opposite the right angle is 5cm. How high is the side opposite the right angle?
3 × 4 △ 2 × 2 △ 5, = 6 × 2 △ 5, = 12 △ 5, = 2.4 (CM). Answer: the height on the opposite side of the right angle is 2.4 cm
Is the angle of a right triangle 45 degrees apart from the right angle
If there are two right triangles congruent, then the angle other than the two right triangles must be 45 degrees?
No, the sum of the other two acute angles is 90 degrees,
But not all of them are 45 degrees
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