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3 tháng 3 2022

68,25

3 tháng 3 2022

68,25

20 tháng 2 2018

\(\left(-6\right).3+6.\left(-11\right)+\left(-6\right).\left(-2\right)\)

\(=\left(-6\right).3+\left(-6\right).11+\left(-6\right).\left(-2\right)\)

\(=\left(-6\right).\left[3+11+\left(-2\right)\right]\)

\(=\left(-6\right).12\)

\(=-72\)

1 tháng 11 2019

52x - 3 - 2 . 52 = 52 : 3

52x - 3 - 2 = 52 : 3 : 52

52x - 3 - 2 = 3

52x - 3 = 3 + 2

52x -3 = 5

52x -3 = 51

⇒ 2x -3 = 1

2x = 1 + 3

2x = 4

x = 4 : 2

x = 2

Vậy x = 2

HQ
Hà Quang Minh
Giáo viên
5 tháng 10 2023

1, 

\(\begin{array}{l}2,5.\left( {4,1 - 3 - 2,5 + 2.7,2} \right) + 4,2:2\\ = 2,5.\left( {4,1 - 3 - 2,5 + 14,4} \right) + 4,2:2\\ = 2,5.\left( {1,1 - 2,5 + 14,4} \right) + 2,1\\ = 2,5.\left( { - 1,4 + 14,4} \right) + 2,1\\ = 2,5.13 + 2,1\\ = 32,5 + 2,1\\ = 34,6\end{array}\)

2, 

Cách 1:

\(\begin{array}{l}2,86.4 + 3,14.4 - 6,01.5 + {3^2}\\ = 11,44 + 12,56 - 30,05 + 9\\ = \left( {11,44 + 12,56} \right) + \left( { - 30,05 + 9} \right)\\ = 24 + \left( { - 21,05} \right)\\ = 24 - 21,05\\ = 2,95\end{array}\)

Cách 2: 

\(\begin{array}{l}2,86.4 + 3,14.4 - 6,01.5 + {3^2}\\ = 4.(2,86+3,14) - 30,05 + 9\\ = 4.6 + \left( { - 30,05 + 9} \right)\\ = 24 + \left( { - 21,05} \right)\\ = 24 - 21,05\\ = 2,95\end{array}\)

12 tháng 12 2021

hoặc trước 5h cx đc ạ

12 tháng 12 2021

help meeeeeeeeeeeeeeeee

Giups mik vs mik đag cần gấp. どうもありがとうございます~~1.             Nam often (go)....................................... to the movies on Sundays.2.             I (travel )....................................... to Vung Tau tomorrow.3.             Nga (watch)....................................... TV every evening.4.             They (play).................................... soccer at the moment.5.             We (go)..................................... to the cinema...
Đọc tiếp

Giups mik vs mik đag cần gấp. どうもありがとうございます~~

1.             Nam often (go)....................................... to the movies on Sundays.

2.             I (travel )....................................... to Vung Tau tomorrow.

3.             Nga (watch)....................................... TV every evening.

4.             They (play).................................... soccer at the moment.

5.             We (go)..................................... to the cinema tonight.

6.             He usually (jog)................................ in the morning.

7.             Mai (be)........................ tired now.

8.             Lan (play ).................................... the piano now.

9.             Nga (listen).................................. to music at the moment.

10.    Where (be)………………your father now ? – He (read)....................... a newspaper.

11.    Look ! The birds (fly)………………………

12.    Listen ! Tuan (sing)………………………..

13.    Our friends (come)....................................... here soon.

14.    He (visit)........................................ his grandparents next week.

15.    I usually (go) …………… to school by bike , but tomorrow I (go)........................... to school by bus.

16.    Jane (play ).................................. the piano at present.

17.    My father (buy)................................ a new car two months ago.

18.    I (be)……………busy last night , so I (miss)...................... a good film on TV.

19.    He (teach)………………….Math at this school in 1986.

20.    There (be)…………….nobody there where I (arrive)....................... yesterday.

21.    Yesterday Lan (not go )............................... to school because she was sick.

22.    How often ………….your father (go)....................... to work ? – six days a week.

23.    What …………you (do) …………tomorrow evening ? – I ( visit)....................... Hoi An ancient town.

24.    They first (meet)............................ each other last week.

25.    Her brother (talk )................................... to his pen pal on the phone at the moment .

0
16 tháng 11 2016

         a(b3-c3) -b(b3-c3+a3-b3)+c(a3-b3)

=a(b3-c3)-b(b3-c3)-b(a3-b3)+c(a3-b3)

=(b3-c3)(a-b)-(a3-b3)(b-c)

=(b-c)(b2+cb+c2)(a-b)-(a-b)(a2+ab+b2)(b-c)

=(b-c)(a-b)(b2+Cb+c2-a2-ab-b2)

=(b-c)(a-b)(c2+cb-ab-a2)

=(b-c)(a-b)[(c-a)(c+a)+b(c-a)]

=(b-c)(a-b)(c-a)(a+c+b)

16 tháng 5 2022

235,05 x 4,2=987,21               9,125 : 2,5=3,65

a: =987,21

b: =3,65