Giúp câu 22 vs
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Giúp mình vs ạ Giúp câu 22 thoi ạ
Giúp câu 22-30 vs ạ
Giải giúp e câu 22 vs ạ
Giúp mink 2 câu 21, 22 vs
22.
\(sinx\le1\Rightarrow3sinx+2019\le3.1+2019=2022\)
Đáp án B
23.
\(C_n^3=\dfrac{A_n^3}{3!}=\dfrac{2022}{6}=337\)
Đáp án A
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Giúp mình vs ạ(câu hỏi đuôi)17. You don’t like playing games, ………………………..?18. They should have been able to do it , ………………………………?19. She doesn’t come here, ………………………………… ?20. Tom can help her, …………………………….. ?21. You won’t be late, …………………………?22. The students should keep silent, …………………………… ?23. Mary seldom wears her dress, ........................................ ?24. Tom and Jerry can’t live in peace, ............................................ ?25. The case weights thirty kilos,................
Đọc tiếp
Giúp mình vs ạ(câu hỏi đuôi)
17. You don’t like playing games, ………………………..?
18. They should have been able to do it , ………………………………?
19. She doesn’t come here, ………………………………… ?
20. Tom can help her, …………………………….. ?
21. You won’t be late, …………………………?
22. The students should keep silent, …………………………… ?
23. Mary seldom wears her dress, ........................................ ?
24. Tom and Jerry can’t live in peace, ............................................ ?
25. The case weights thirty kilos,............................................. ?
17 do you
18 shouldn't they
19 does she
20 can't he
21 will you
22 shouldn't they
23 does she
24 can they
25 doesn't it
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17 do you
18 shouldn't they
19 does she
20 can't he
21 will you
22 shouldn't they
23 does she
24 can they
25 doesn't it
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17. You don’t like playing games, do you ?
18. They should have been able to do it , shouldn't they ?
19. She doesn’t come here, dose she?
20. Tom can help her, can't he ?
21. You won’t be late, will you ?
22. The students should keep silent, shouldn't they ?
23. Mary seldom wears her dress, does she ?
24. Tom and Jerry can’t live in peace, can they ?
25. The case weights thirty kilos, doesn't it ?
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-15+17-22+15-17+22
.giúp mk tính từg bước vs ạk.
=-15+15+17-17-22+22
=0+17-17-22+22
=0+0-22+22
=0+0+0
=0
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Câu 1: Tính
a) 100 + (+430) + 2145+ (-530)
b) (-12).15
c) (+12).13 + 13.(-22)
d) {[14 : (-2)] + 7} : 2020
giúp mk vs mk đag cần gấp
a) 100 + (+430) + 2145+ (-530)
= 100+ 430 + 2145 - 530
= 530 - 530 +2145
= 0 + 2145 = 2145
b) (-12).15 = -10.15 -2.15 = -150 - 30 = -180
c) (+12).13 + 13.(-22)
= 13. (12 - 22)
= 13. (-10)
= -130
d) {[14 : (-2)] + 7} : 2020
= { - 7 + 7} : 2020
= 0 : 2020
=0
Học tốt
a) 100+430+2145+(-530)
=(100+2145)+[430+(-530)]
=2245+(-100)=2145
b) (-12).15=-180 (nếu muốn tính nhanh : (-12).15=(-3).4.15=(-3).60=-180)
c) 12.13+13.(-22)=13[12+(-22)]
=13.(-10)=-130
d) {[14:(-2)]+7}:2020
={(-7)+7}:2020
=0:2020=0
(+430) hay (-430)?
a) 100 + (+430) + 2145 + (-530) =530+2145+(-530)=2675+(-530)=2145
b) (-12).15=180
c) 12.13+13.(-22)=[12.(-22)] + 13 = -246+13=-251
d) {[14/(-2)]+7}/2020={[(-7)+7]}/2020=0/2020=0
Ko biết đúng hay sai :V
Xem thêm câu trả lời
xy-7x+y=-22
giúp vs ik mn
xy - 7x + y = -22
=> x(y - 7) + y - 7 = -29
=> x(y - 7) + (y - 7) = -29
=> (x+1)(y - 7) = -29
ta có bảng :
| x+1 | -1 | 1 | -29 | 29 |
| y-7 | -29 | 29 | -1 | 1 |
| x | -2 | 0 | -30 | 28 |
| y | -22 | 36 | 6 | 8 |
\(xy-7x+y=-22\)
\(xy+y-7x=-22\)
\(y\left(x+1\right)-7x=-22\)
\(y\left(x+1\right)-7x-7=-22-7\)
\(y\left(x+1\right)-\left(7x+7\right)=-29\)
\(y\left(x+1\right)-7.\left(x+1\right)=-29\)
\(\left(y-7\right)-\left(x+1\right)=-29\)
Ta có bảng sau:
| y-7 | -29 | 1 | -1 | 29 |
| x+1 | 1 | -29 | 29 | -1 |
| y | -22 | 8 | 6 | 36 |
| x | 0 | -30 | 28 | -2 |
Vậy ....................................
Giúp mik vs Tính tổng sau: E=1-2+22-23+...+21000
Lời giải:
$E=1-2+22-23+24-25+.....+21000$
$=(1-2)+(22-23)+(24-25)+......+(20998-20999)+21000$
$=(-1)+(-1)+(-1)+....+(-1)+21000$
Số lần xuất hiện của -1: $[(20999-22):1+1]:2+1=10490$
$E=(-1).10490+21000=10510$
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