giups mik vs mik cần gấp
2,5x(4,1-3-2,5+2x7,2)+4,2:2
tính hợp lí: (-6).3+6.(-11)+(-6).(-2)
Giups mik vs mik đang cần gấp !
\(\left(-6\right).3+6.\left(-11\right)+\left(-6\right).\left(-2\right)\)
\(=\left(-6\right).3+\left(-6\right).11+\left(-6\right).\left(-2\right)\)
\(=\left(-6\right).\left[3+11+\left(-2\right)\right]\)
\(=\left(-6\right).12\)
\(=-72\)
5^2x-3-2(ở dưới).5^2=5^2:3
GIUPS MIK VS MIK CẦN GẤP
CÁM ƠN NHÁ
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
(x-2)^2 + (y+3)^2=21
Giups mình vs ak, mik đg cần gấp
Tính giá trị của các biểu thức sau:
1. \(2,5.\left( {4,1 - 3 - 2,5 + 2.7,2} \right) + 4,2:2\)
2. \(2,86.4 + 3,14.4 - 6,01.5 + {3^2}\)
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:
\(\begin{array}{l}2,86.4 + 3,14.4 - 6,01.5 + {3^2}\\ = 4.(2,86+3,14) - 30,05 + 9\\ = 4.6 + \left( { - 30,05 + 9} \right)\\ = 24 + \left( { - 21,05} \right)\\ = 24 - 21,05\\ = 2,95\end{array}\)
Mik đang cần gấp tr 4h30 chiều nay!! Giups mik vs ạ
1a/ \(10^{2001}\) có chữ số tận cùng là 0
\(\Rightarrow10^{2001}+2\) có chữ số tận cùng là 2 ⇒ chia hết cho 2, không chia hết cho 5
Mà \(10^n=10000...\) (n chữ số 0) \(\Rightarrow10^{2001}+2\) có dạng \(\overline{100....01}\) chia hết cho 3, không chia hết cho 9.
Vậy: \(10^{2001}+2\Rightarrow\begin{matrix}⋮2;3\\⋮5;9̸\end{matrix}\)
b/ \(10^{2001}\) có chữ số tận cùng là 0 \(\Rightarrow10^{2001}-1\) có chữ số tận cùng là 9 ⇒ không chia hết cho 2, 5.
Mà \(10^{2001}-1\) có dạng \(\overline{999....9}\) ⇒ chia hết cho 9 ⇒ chia hết cho 3.
Vậy: \(10^{2001}-1\left\{{}\begin{matrix}⋮3;9\\⋮̸2;5\end{matrix}\right.\)
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 .
a, 6,5 - 9/4 :| x + 1/3 |= 2
b, 11/4 + 3/2: | 4x - 1/ 5|= 7/2
c, 15/4 - 2,5 :| 3/4x + 1/2|= 3
Mn giúp mik vs mik đang cần gấp
Phân tích đa thức thành nhân tử: \(a\left(b^3-c^3\right)+b\left(c^3-a^3\right)+c\left(a^3-b^3\right)\)
Giups mik vs, mik đang cần gấp
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)
235,05 x 4,2= 9,125 : 2,5
GIẢI HỘ MIK NHÉ ! GIẢI CẢ TẤT!!!!!!!!!!!!!!!!!!!!!!!!
235,05 x 4,2=987,21 9,125 : 2,5=3,65