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3 tháng 2 2016

lx2+3+lx-3ll=(3-x)2

Vì (3-x)2 lớn hơn hoặc =0

=>x2+3+lx-3l=(3-x)2

=>x2+3+lx-3l=9-6x+x2

=>3+lx-3l=9-6x

=>lx-3l=6-6x

xét x<3:

=>-(x-3)=6-6x

=>-x+3=6-6x

=>6x-x=6-3

=>5x=3

=>x=0,6

xét x>(=)3:

=>x-3=6-6x

=>6x+x=6+3

=>7x=9

=>x=9/7<3     (trái giả thuyết)

vậy x=0,6

bài này tui không biết làm nên tôi hỏi anh tui

xin tự giới thiệu,tui là em gái của Nguyễn Thiều Công Thành

 

tiếng anh mày giỏi đó

21 tháng 12 2015

+x>-3 => x2 +x+6 =9-6x+x2 => 7x=3 => x =3/7 (TM)

+x< -3  => |x2 -x| = 9 -6x +x2 => x2 -x =9-6x+x2 => 5x = 9 => x = 9/5 loại

=> x = 3/7

19 tháng 12 2015

=>3(x+3)=7.(2-x)

=>3x+9=14-2x

=>3x+2x=14-9

=>5x=5=>x=1

28 tháng 12 2015

X=-2,7

 Tick đi,ns cách làm cho

Fill in the blank with the suitable number (Note: write decimal number with "the dot" between number part and fraction part. Example: 0.5)Question 1:Given .Calculate: .Question 2:Given two triangles  and .If  and  then .Question 3:Suppose that  is directly proportional to  with the scaling factor is .If  and  then k=.Question 4:In this figure, find the value of ?Answer: .(write your answer by decimal in simplest form)Question 5:Find the value of ?Answer: .(write your...
Đọc tiếp

Fill in the blank with the suitable number (Note: write decimal number with "the dot" between number part and fraction part. Example: 0.5)

Question 1:
Given .
Calculate: .

Question 2:
Given two triangles  and .
If  and  then .

Question 3:
Suppose that  is directly proportional to  with the scaling factor is .
If  and  then k=.

Question 4:

In this figure, find the value of ?
Answer: .
(write your answer by decimal in simplest form)

Question 5:

Find the value of ?
Answer: .
(write your answer by decimal in simplest form)

Question 6:
Given two triangles  and .
If  and  then the perimeter of  is .

Question 7:

In this figure, .

Question 8:

The value of .
(write your answer by decimal in simplest form)

Question 9:
The perimeter of a triangle is  and the sides of its are in a ratio of .
Then the sides's length of the triangle are .
(write your answer from least to greatest and used ";")

Question 10:

Fill the suitable number in the "?".
Answer: .

 

 

 

giúp mik vs nha please

1
19 tháng 7 2016

đề cho kiểu này thì ông nội nó làm

Fill in the blank with the correct numberQuestion 1:Complete the number pattern:  0,3,8,15,24,,48.Question 2:Find the area of the shaded region if A and B are squares of sides 5cm and 8cm respectively. Answer: The area of the shaded region is  .(write your answer by decimal in simplest form)Question 3:If , compute =.Question 4:The side of each square grid is 2cm. Find the area of the shaded region.Answer: The area of the shaded region is  .Question 5:If , find the value of m...
Đọc tiếp

Fill in the blank with the correct number

Question 1:
Complete the number pattern: 
 0,3,8,15,24,,48.

Question 2:
Find the area of the shaded region if A and B are squares of sides 5cm and 8cm respectively. 

Answer: The area of the shaded region is  .
(write your answer by decimal in simplest form)

Question 3:
If , compute =.

Question 4:

The side of each square grid is 2cm. Find the area of the shaded region.
Answer: The area of the shaded region is  .

Question 5:
If , find the value of m in .
Answer: m=.

Question 6:
How many whole numbers between 1 and 100 are not divisible by 3 or 11?
Answer:  numbers.

Question 7:
Evaluate:
=.
(round to four decimal places)

Question 8:
Evaluate:
=.
(write your answer by decimal in simplest form)

Question 9:
Find the whole number A knowing that A is 9 units greater than the average of A, 38, 45 and 67.
Answer: A=.

Question 10:
Find the whole number C knowing that C is 14 units smaller than the average of C, 68, 72, 99.
Answer: C=.

3
15 tháng 4 2017

Câu 3, 4, 5, 7, 8 các câu bỏ qua nhé

15 tháng 4 2017

Câu 3, 4, 5, 7, 8 các cậu bỏ qua nhé

3 tháng 3 2016

a+b+c=19,25

9 tháng 3 2023

2,125

 

11 tháng 3 2023

51 hours `=51:24=2,125` days