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14 tháng 9 2023
\(2^{10}:64\cdot16\)
\(=2^{10}:2^6\cdot2^4\)
\(=2^{10-6+4}\)
\(=2^8\)
14 tháng 9 2023
\(2^{10}.64.16\\ =2^{10}.2^6.2^4\\ =2^{10+6+4}=2^{20}\)
FL
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?
\(B=cos^212+sin^2\left(90-78\right)+cos^21+sin^2\left(90-89\right)\)
\(=cos^212+sin^212+cos^21+sin^21=1+1=2\)
\(C=sin^23+sin^215+cos^2\left(90-75\right)+cos^2\left(90-87\right)\)
\(=sin^23+cos^23+sin^215+cos^215=1+1=2\)
\(E=\dfrac{tan64}{cot26}-1=\dfrac{tan64}{tan\left(90-26\right)}-1=\dfrac{tan64}{tan64}-1=1-1=0\)