2003² - 2002.2003

= 2003.(2003 - 2002)

= 2003 . 1

= 2003

-------------------

7(x - 2) + 2³ = 2.5²

7(x - 2) + 8 = 2.25

7(x - 2) = 50 - 8

7(x - 2) = 42

x - 2 = 42 : 7

x - 2 = 6

x = 6 + 2

x = 8

-------------------

23 + (27 - 7.6) - (94.7 - 27.99)

= 23 + 27 - 42 - 658 + 2673

= 23 + (27 + 2673) - (42 + 658)

= 23 + 2700 - 700

= 23 + 2000

= 2023

`2023^2-2022.2023`

`=2023.2023-2022.2023`

`=2023.(2023-2022)`

`=2023.1`

`=2023`

__

` 23 + (27 - 7.6) - (94.7 - 27.99)`

` = 23 + (27 - 42) - (658 - 2673)`

` = 23 + (-15) - (-2015)`

` = 8 + 2015`

` = 2023`

\(2023^2-2022.2023\)

\(=2023\left(2023-2022\right)\)

\(=2023.1\)

\(=2023\)

\(23+\left(27-7.6\right)-\left(94.7-27.99\right)\)

\(=23+27-7.6-94.7+27.99\)

\(=23+\left(27+27.99\right)-\left(7.6+94.7\right)\)

\(=23+27\left(1+99\right)-7.\left(6+94\right)\)

\(=23+27.100-7.100\)

\(=23+2000\)

\(=2023\)

Mình tính ra là 2023.Có ai có ý kiến không ?

what the heo my

mình ra 2023 có ai ra 2023 ko

ai có thì để lại cho mik 1 cái tích đúng nha

cảm ơn các bạn

\(A=\frac{2}{1.4}+\frac{2}{4.7}+\frac{2}{7.10}+...+\frac{2}{97.100}\)

\(A=2\left(\frac{1}{1.4}+\frac{1}{4.7}+\frac{1}{7.10}+...+\frac{1}{97.100}\right)\)

\(A=2\left(1-\frac{1}{4}+\frac{1}{4}-\frac{1}{7}+\frac{1}{7}-\frac{1}{10}+...+\frac{1}{97}-\frac{1}{100}\right)\)

\(A=2\left(1-\frac{1}{100}\right)\)

\(A=2.\frac{99}{100}=..............\)

Tự làm nốt nha

what?

=2016 nha

1.

`16 + (27 - 7.6 ) - (94 -7 - 27.99)`

`= 16+ 27 - 7.6 - 94 + 7 + 27.99`

`= 16 + 27(99 +1) - 7(6-1) - 94`

`= -78 + 27.100 - 7.5`

`= 2587`

2.

`A = 2/1.4 + 2/4.7 + 2/7.10 +...+ 2/97.100`

`A= 2(1/1.4 + 1/4.7 + 1/7.10 +...+1/97.100)`

`3A = 2 (3/1.4 + 3/4.7 + 3/7.10+...+ 3/97.100)`

`3/2 A = 1 - 1/4 + 1/4 - 1/7 +...+ 1/97 - 1/100`

`3/2A = 1 - 1/100`

`3/2 A= 99/100`

`A= 99/100 : 3/2`

`A=33/50`

Vậy `A= 33/50`

1.16+(27-7.6)-(94-7-27.99)=16+27-7.6-94+7+27.99

                                           =(27+27.99)+(27+7-94)+16

                                           =27.100-60+16

                                           =2700-44=2656

2.A=\(\dfrac{2}{1.4}+\dfrac{2}{4.7}+\dfrac{2}{7.10}+...+\dfrac{2}{97.100}\)

     =\(\dfrac{1}{1}-\dfrac{1}{4}+\dfrac{1}{4}-\dfrac{1}{7}+...+\dfrac{1}{97}-\dfrac{1}{100}\)

     =\(1-\dfrac{1}{100}=\dfrac{99}{100}\)

1) \(16+\left(27-7.6\right)-\left(94-7-27.99\right)\)

=\(16+27-7.6-94+7+27.99\)

=\(\left(27+27.99\right)+\left(-7.6+7\right)+\left(16-94\right)\)

=\(27\left(1+99\right)+7\left(-6+1\right)-78\)

=\(27.100-7.5-78=2700-35-78=2587\).

2) \(A=\dfrac{2}{1.4}+\dfrac{2}{4.7}+\dfrac{2}{7.10}+...+\dfrac{2}{97.100}\)

\(A=\dfrac{2.3}{1.4.3}+\dfrac{2.3}{4.7.3}+\dfrac{2.3}{7.10.3}+...+\dfrac{2.3}{97.100.3}\)

\(A=\dfrac{2}{3}.\left(\dfrac{3}{1.4}+\dfrac{3}{4.7}+\dfrac{3}{7.10}+...+\dfrac{3}{97.100}\right)\)

\(A=\dfrac{2}{3}.\left(\dfrac{1}{1}-\dfrac{1}{4}+\dfrac{1}{4}-\dfrac{1}{7}+\dfrac{1}{7}-\dfrac{1}{10}+...+\dfrac{1}{97}-\dfrac{1}{100}\right)\)

\(A=\dfrac{2}{3}.\left(\dfrac{1}{1}-\dfrac{1}{100}\right)=\dfrac{2}{3}.\dfrac{99}{100}=\dfrac{33}{50}\)

27,3-16,14=11,16

27(16-13)-16(27-13)

=27.16-27.13-16.27+16.13

=(27.16-16.27)+(-27.13+16.13)

=0+13(-27+16)

=0+13.-11

=0+-143=-143

Trả lời :

  27 .( 16 - 13 ) - 16 . ( 27 - 13 )

= 27 . 16 - 27 . 13 - 16 . 27 + 16 . 13

= ( 27 . 16 - 16 . 27 ) + 16 . 13 - 27 .13 

=   0  + 13 . ( 16 - 27 )

=   13 . ( - 11 )

=     - 143

- Study well -

a) - 36 . (16 - 41) - 16 . (41 - 36)

= -36.(-25)-16.5

= 900-80

= 820

b) - 15. (-27 + 30) - 27 . (30 - 15) - 30 . (5 - 27)

= -15.3-27.15-30.(-22)

= -45-405.(-660)

= (-450).(-660)

= 297000

=5.4+6.5+7.6+8.7-4.4-5.5-6.6-7.7

=(5,4 - 4,4)+(6,5-5,5)+(7,6-6.6)+(8,7-7,7)

=1+1+1+1

=4

Dấu chấm là nhân hay phẩy bạn
 

=5.4+6.5+7.6+8.7-4.4-5.5-6.6-7.7

=(5,4 - 4,4)+(6,5-5,5)+(7,6-6.6)+(8,7-7,7)

=1+1+1+1

=4