(1-1 / 1-A) / a square-2a + 1 / A

(1-1 / 1-A) / a square-2a + 1 / A

(1-1 / 1-A) △ a of (A-2 a + 1)
=-a/(1-a) × (1-a)²/a
=a-1

The length of three sides of a right triangle is the diameter of three semicircles, and the length of two right sides is 6 and 8 respectively

Method 1: 1. Analysis: see that two shadow semicircles contain two arches, and two arches and a special right triangle form a large semicircle. Through observation, it is found that this question is about 6, 8 and 10. 2. Idea: use (the area sum of two small semicircles with shadow) - (the blank big

X / 28 + (2x-14) / 35 + 12 / 50 = (2x-14) / 28 + X / 35 solve the equation quickly

5x+4(2x-14)+12×140/50=5(2x-14)+4x
5x+8x-56+33.6=8x-70+4x
13x-22.4=12x-70
13x-12x=22.4-70
x= -47.6

Given the curve y = root x, 1. Find the tangent on the curve parallel to the straight line y = 2X-4
2. Find the tangent equation of point P (0,5) and tangent to the curve

1 y '= (1 / 2) / √ x, let the tangent point be p (x0, Y0) (x0 > 0), the tangent is parallel to the straight line y = 2X-4, the slope k = 2, from (1 / 2) / √ x0 = 2 = = > x0 = 1 / 16, Y0 = 1 / 4, the tangent equation is Y-1 / 4 = 2 (x-1 / 16), that is, 16x-8y + 1 = 0.2 question: let the tangent point be (x1, Y1) and the tangent equation be y = KX + 5, then k = 1 / (2 √ x1) (1)

Rational number is the general name of positive integer, negative integer, positive fraction, negative fraction and zero. What is the definition of the concept of rational number?
Denotation definition. Denotation of concept is the subclass or molecule contained in this introduction

Integers and fractions are called rational numbers, positive integers, negative integers and zeros are called integers, positive fractions and negative fractions are called fractions
Rational numbers are positive integers, negative integers, positive fractions, negative fractions and zeros

It is known that the function y = f (x) defined on R is an increasing function, and if x ≥ 0, f (x) = ln (X & # 178; - 2x + 2)
(1) When x

Let - x > 0, that is, x < 0, then f (- x) = ln (x ^ 2 + 2x + 2) because it is an odd function f (- x) = - f (x), so f (x) = - ln (x ^ 2 + 2x + 2) ln is an increasing function, X ≥ 1 is X & # 178; - 2x + 2 is an increasing function, 0 ≤ x < 1 x & # 178; - 2x + 2 is a decreasing function, when - 1 < x < 0, x ^ 2 + 2x + 2 is an increasing function, when x ≤ - 1, x ^ 2 +

The product of a number and 5 / 6 is the reciprocal of 3 / 5. What is this number?

2

Using the collocation method to solve the equation (4y-3) (3y-1) = 25 / 6

(4y-3) (3y-1) = 25 / 6
12y²-9y-4y+3-25/6=0
12y²-13y-7/6=0
72y²-78y-7=0
(12y+1)(6y-7)=0
12y+1=0 6y-7=0
∴y₁=-1/12
y₂=7/6

What is the number of zeros of the function f (x) = x & # 179; - X & # 178; - x + 1 in the interval (0,3)?
Not only the answer but also the solution

X & # 179; - X & # 178; - x + 1 = x & # 178; (x-1) - (x-1) = (x-1) (X & # 178; - 1) = (x-1) &# 178; (x + 1) = 0, so x = - 1 f (x) = 0 or x = 1 f (x) = 0 has two

It is known that the parabola y = x (M + 2) x-2m, when m = x, the parabola passes through the origin

Let's take all x and Y into zero because we pass through the origin