Giúp mik câu 2,4,5,6,8,9,10 với ak
K
Khách
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Những câu hỏi liên quan
FL
0
VN
1
H9
HT.Phong (9A5)
CTVHS
16 tháng 6 2023
\(2022\times2005-2000\times2022+15\times2022-20\times2021\)
\(=2022\times\left(2005-2000+15\right)-20\times2021\)
\(=2022\times20-20\times2021\)
\(=20\times\left(2022-2021\right)\)
\(=20\times1\)
\(=20\)
NT
Nguyễn Thị Thương Hoài
Giáo viên
VIP
16 tháng 6 2023
a, 2022 \(\times\) 2005 - 2000 \(\times\) 2022 + 15 \(\times\) 2022 - 20 \(\times\) 2021
= (2022 \(\times\) 2005 - 2000 \(\times\) 2022 + 15 \(\times\) 2022 )- 20 \(\times\) 2021
= 2022 \(\times\) (2005 - 2000 + 15) - 20 \(\times\) 2021
= 2022 \(\times\) (5 +15) - 20 \(\times\) 2021
= 2022 \(\times\) 20 - 20 \(\times\) 2021
= 20 \(\times\) (2022 - 2021)
= 20 \(\times\) 1
= 20
30 tháng 6 2017
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NV
Nguyễn Việt Lâm
Giáo viên
18 tháng 9 2021
\(B=cos^212+sin^2\left(90-78\right)+cos^21+sin^2\left(90-89\right)\)
\(=cos^212+sin^212+cos^21+sin^21=1+1=2\)
\(C=sin^23+sin^215+cos^2\left(90-75\right)+cos^2\left(90-87\right)\)
\(=sin^23+cos^23+sin^215+cos^215=1+1=2\)
\(E=\dfrac{tan64}{cot26}-1=\dfrac{tan64}{tan\left(90-26\right)}-1=\dfrac{tan64}{tan64}-1=1-1=0\)
KY
12 tháng 7 2021
refer
They/ play/ tennis/ 10.30 yesterday morning.
→ They were playing tennis at 10.30 yesterday morning .
Ann/ do/ homework/ 5 o’clock this afternoon.
→ Ann was doing homework at 5 o'clock this afternoon.
My father/ wash/ car/ from/ five to six.
→ My father was washing a/the/his car from five to six.
This time last year/ we/ live/ France.
→ This time last year , we were living in France .
The students/ offer/ flowers/ the visitors.
→ This students offered flowers to the visitors.
I/ cook/ dinner/ half an hour ago.
→ I was cooking dinner half an hour ago.
She/ work/ the studio/ that time.
→ She was working the studio at that time.
What/ you/ do/ from 3 to 6 yesterday afternoon?
→ What were you doing from 3 to 6 yesterday afternoon?
DT
Đỗ Thanh Hải
CTVVIP
12 tháng 7 2021
1 They were playing tennis at 10.30 yesterday morning
2 Ann was doing her homework at 5 o'clock this afternoon
3 My father was washing his car from five to six
4 This time last year we were living in France
5 The students were offering the flowers to the visitors
6 I was cooking dinner half an hour ago
7 She was working at the studio at that time
8 What were you doing from 3 to 6 yesterday afternoon?
